Hobby Stock -- Unless otherwise noted, all parts to be approved OEM and must match make and year of car.
1. SAFETY EQUIPMENT: Rules
2. FRAME: Any American OEM full body rear wheel drive passenger car, 1964 or newer, full frame or unibody. Frame must match body. Minimum 107.5 inch wheelbase, maximum one inch difference from side to side. Rear of frame behind rear
3. ROLL CAGE: Main cage must consist of continuous hoops, minimum 1.75 inch O.D. tubing, with a wall thickness of at least .095 inch, low carbon or mild steel recommended. Four-post roll cage required, front down bars and rear hoop must be welded to OEM frame. Driver’s head must not protrude outside cage with helmet on. Rear hoop must have “X” brace, consisting of one full horizontal and one full diagonal bar, minimum 1.25 inch O.D. and .083 inch wall thickness. Front down bars must be tied together, passenger side front down bars must be maximum 11 inches in from top of door. Must be minimum 40 inches between front and rear down bars at top of door panel. Maximum 41 inches from top center of windshield to front edge of rear hoop; maximum 13 inches to front edge of top halo. Top halo must be minimum 40 inches across, outside to outside. Rear hoop may be maximum 12 inches in from bottom of opera window. Minimum one cross bar in top halo. May have maximum two horizontal bars, (in addition to bar tying front frame horns together) for radiator protection; must be behind bumper, within confines of body, no wider than OEM frame horns. Rear kickers (down bars) and engine hoop required, and must be minimum 1.25 inch O.D. tubing, with .083 inch wall thickness. Fuel cell protection required, must be mounted frame rail to frame rail, no higher than fuel cell, inside trunk area with maximum 1.75 inch O.D. tubing. All bars must be inside body.
4. DOOR BARS: All door bars and uprights must be minimum 1.75 inch O.D. and .095 inch wall thickness. Minimum three door bars, both sides, parallel to ground, and perpendicular to driver. Minimum four uprights tied from frame to top door bar on driver side, and minimum three uprights on passenger side. Steel door plates, 18 gauge or .049 inch minimum thickness, must be securely welded to outside of door bars on driver’s side. Plate must cover area from top door bar to rocker panel and from rear down post to five inches in front of seat. Must be visible for inspection.
5. BODY: All bodies must be unaltered OEM, or OEM replacement, in OEM location and match frame. Front body mounts must be visible. Sunroofs and T-tops must be enclosed. Aftermarket plastic nose piece allowed, recommended to match body. No spoilers, hood scoops, ground effects or skirting altering OEM appearance. OEM STEEL hood only, hood may be gutted. OEM STEEL trunk lid only, no gutting. Hood and trunk must be securely fastened and back of hood must be sealed off from driver compartment with metal. Hood must be separate from fenders. Front inner wheel wells may be removed, rear wheel wells may be removed to middle seam. Trunk floor directly over rear end housing must be removed. No overlapping or shortening of body panels. All glass must be removed, all windows in body must remain open; maximum seven inch metal sun visor allowed across top of windshield opening. All doors must be securely fastened. Fenders and quarter panels may be trimmed for tire clearance, ONLY. No reflective body panels.
6. DRIVER COMPARTMENT: Minimum three windshield bars in front of driver. Aluminum high-back seat only, bolted to roll cage. Driver seat may be no further back than rear edge of B-pillar. Driver must be sealed off from track, driveline, engine and fuel cell. Dash not to extend more than 24 inches back from center of lower windshield opening. Dash must be flat, rear can be no higher than front, except for cowl in front of driver. No other interior tin or covers. Inside rear quarter panels, below window level, may be cut out. Doors may be gutted. No cutting out of firewalls, roof, floor, kick panels, rocker panels, or trunk floor, except for roll cage clearance. All holes in firewalls and floor must be covered with metal. Rear firewall and speaker deck must be metal and be of OEM design for that make and model. No mirrors or reflective sun visors.
7. FRONT SUSPENSION: All components and mounts must be steel, unaltered OEM, in OEM location and match frame. OEM rubber A-frame bushings only. No aftermarket ball joints. No sway bars, spring spacers, chains or cables. Exceptions are: for 1978-1987 GM mid-sized metric frame, OEM upper A-frame may be replaced using aftermarket upper A-frame (steel or aluminum cross shaft allowed), must display “IMCA approved” decal on top of rear tube of A-frame; bolt on spindle savers allowed. Upper A-frame mount must remain OEM and cannot be moved.
8. STEERING: All components must be steel unaltered OEM, in OEM location and match frame. OEM steering column may be replaced with steel steering shafts (collapsible steering shaft recommended). Steel knuckles only. No steering quickeners, or remote power steering reservoirs. Steering wheel and quick release may be aluminum.
9. SHOCKS: One unaltered steel, nonadjustable, OEM-mount shock, in OEM location, per wheel. No coil-over shocks, air shocks, remote reservoir shocks. No Schrader or bladder type valve allowed. No coil-over eliminators. Rear OEM shock location is 4.5 inches from bottom of housing to center of bolt hole, and centered on control arm bracket. $50 claim on any shock. One or all shocks on car may be claimed per event, counting as one claim on card, following shock claim procedures and penalties
10. SPRINGS: One steel spring per wheel only in OEM location. All coil springs must be minimum 4.5 inches O.D. and non-progressive. No spring rubbers allowed.
11. REAR SUSPENSION: All components and mounts must be steel, unaltered, OEM, in OEM location and match frame. OEM rubber control arm bushings only. Center of rear lower control arm bolt hole must be 2.25 to 2.5 inches from bottom of housing. No independent rear suspension. No sway bars, panhard bars, spring spacers, extensions, chains or cables.
12. REAR END: No floater rear ends. OEM, or OEM replacement SOLID steel axles only. Nine inch Ford rear end allowed, but must be mounted like OEM rear end (centered) for that make and model. One inch inspection hole in housing required. No lightened ring gears. Must be welded spider gears, or mini spool. No torque dividing differentials.
13. BUMPERS/RUB RAILS: Bumpers must be approved OEM in OEM location, capped to fender with steel. Maximum one inch wide by two inch tall steel rub rails bolted flush to body from fender well to fender well and rear quarter panel. Lexan type also allow. Front and rear tow hooks mandatory.
14. TIRES/WHEELS: Unaltered OEM 205/75, or 205/70, 14 inch, or 15 inch passenger car tires only. All four tires and wheels must be same size. Tires must be inside body. No racing, snow, or all-terrain tires. No softening, conditioning, siping/grinding or grooving. Maximum seven inch wide, three to four inch offset, unaltered, D.O.T.-stamped steel wheels with standard bead bump - must weigh a minimum of 21 pounds. Reinforcing of stock wheels recommended. No wheel spacers. One inch O.D. steel lug nuts required. No bleeder valves. YOU CAN RUN ONE 7 INCH BEAD LOCK ON RIGHT REAR WITH A MINIMUM OF 25 POUNDS OF AIR IN TIRE BEFORE RACE. WILL BE CHECKED!! THIS TRACK RULE ONLY, NOT IMCA APPROVED.
15. BRAKES: Steel, unaltered OEM, or unaltered OEM replacement, operative four wheel, disc (front) and drum (rear) brakes, and must match frame. Master cylinder must be in OEM location. No antilock brake systems. No aftermarket brake pedal assemblies, brake shut-off or bias adjuster. Steel brake lines only, must be visible. Hubs/rotors, axle flanges and drums may be changed to different bolt pattern and larger studs.
16. EXHAUST: OEM cast iron exhaust manifolds only. No center dump type manifolds. Exhaust must extend past firewall and turn towards ground. Maximum two-inch O.D. exhaust pipes. Must remain dual exhaust, no crossover or ‘Y’ pipes. No exhaust sensors. Mufflers recommended.
17. FUEL SYSTEM: Mechanical OEM type push rod fuel pumps only. Unaltered OEM two barrel carburetor for that engine, except: booster I.D. may be machined to 0.25 inch and venturi I.D. machined to 1.375 inch and throttle bore I.D machined to 1.6875 inch on Rochester carburetor. Must remove carburetor choke plate. No carburetor spacers. One 0.25 inch (maximum) thickness gasket only. $50 cash claim on carburetor, following carburetor claim procedures and penalties (see rule book). Air cleaner top/stud cannot direct air into carburetor. No top flow air cleaner housings, cold air boxes or air cleaner duct work. Maximum 22 gallon racing fuel cell required, must be in minimum 20 gauge steel container. Must be securely fastened in trunk above level of OEM trunk floor, behind rear tires, no further forward than factory seam where rear frame rail can be replaced, with minimum two solid steel straps around entire cell, two inches wide and .125 inch thick. No fuel cells allowed over rear end housing. Metal firewall must be between driver and fuel cell. All cell mounts must be steel, securely welded to frame/cage. No adjustable fuel cell mounts. Fuel cell vents, including cap vent, must have check valves. If fuel cell does not have aircraft style positive seal filler neck/cap system - a flapper, spring or ball type filler rollover valve is required. Fuel lines through driver compartment must run through metal pipe or metal conduit. One fuel filter only, cannot be in driver’s compartment. No cool cans.
18. FUEL: Gasoline only, no ethanol. Pump grade recommended. No performance enhancing additives or scented additives. Fuel must pass both dialectric meter and chemical tests. Fuel sample may be taken from any car at any time. Penalty for illegal fuel is disqualification from event and $250 fine - first offense.
19. WEIGHT: No ballast allowed. Any item deemed as ballast will be required to be replaced, i.e. fuel cell straps, fuel cell cans, battery boxes, etc. No titanium, magnesium or carbon fiber products. No gun-drilled, tubular, hollow bolts or studs. Steel fasteners only.
20. BATTERY/STARTER: One 12 volt passenger car battery only, must be in marine-type case, securely mounted to frame or roll cage in metal frame behind seat or in trunk area between frame rails. Starter must bolt in OEM location. Car must have capability of starting without being pushed or pulled. Car must leave initial staging area on demand, unaided, or go to rear of that race. Battery must be in marine type case if mounted in drivers compartment.
21. GAUGES/ELECTRONICS: No unapproved cameras, transmitting or listening devices, timing retard controls, or digital gauges (including tach). No electronic monitoring computer devices capable of storing or transmitting information except analog tach. No ignition control boxes. OEM ignition only. Ford/Chrysler may use HEI distributor. No billet housings or crank triggers. All ignition rotors, caps, coils and modules must remain OEM-appearing. No alternators. No electronic traction control devices ($10,000 fine).
22. TRANSMISSION/DRIVE SHAFT: All forward and reverse gears must be operational.
Manual: Must be unaltered OEM three or four speed, with minimum 10.5 inch steel/organic single disc-type clutch and steel pressure plate assembly inside an explosion-proof steel bellhousing - minimum 270 degrees around top of clutch and flywheel area. No lightweight bellhousings. No hydraulic clutch release bearing. Steel unaltered flywheel only - 16 pound minimum
Automatic: Must be unaltered OEM, with unaltered OEM pump, original bellhousing and minimum 10 inch diameter torque converter containing a minimum of three quarts of fluid. Torque converter must have a minimum .125 inch plug. Flexplate must be full, unaltered OEM, or OEM replacement.
Drive shaft: Steel drive shaft (minimum 2.5 inch diameter) and slip-yokes only. Drive shaft must be painted white. 360-degree driveshaft loop required and must be constructed of minimum .25 inch by two inch solid steel, or one inch tubing, mounted six inches back from front U-joint.
. 23. ENGINE COMPARTMENT: Engine must be in OEM location. On GM metric frame, center of fuel pump must be located minimum 1.75 inches in front of cross member (measured at frame). Ford metric frames must have back of fuel pump in front of cross member. Frame and cross member may not be altered for engine placement. Engine mount holes cannot be removed or altered on block. Aftermarket steel engine mounts allowed. No mid-plate allowed. Engine must be OEM appearing, must be able to be used in conventional passenger car without alteration. GM with GM, Ford with Ford, Chrysler with Chrysler. Minimum two-core radiator, must be mounted in front of engine. Overflow tubes must be directed to ground. Steel or aluminum V-belt pulleys only. No electric fans.
24. ENGINE SPECIFICATIONS: Any American make engine allowed. Steel heads, block and oil pan only. OEM passenger vehicle production block only. No GM Bowtie, Ford SVO or Chrysler W blocks. GM approved block numbers are: 3892657, 3914660, 3914678, 3932388, 3932386, 3956618, 3970000, 3970006, 3970010, 3970014, 10066033, 10066036, 10243880, 14010207, 14010209, 14010287, 14016376, 14016379, 10054727, 14088528, 14088548, 14088552, 14093638, 14101148. Stroke must match block. No 400 or larger cubic inch parts allowed. Maximum 361 cubic inches (GM); 363 cubic inches (Ford); 370 cubic inches (Chrysler). Maximum compression ratio is 9.0 to 1, no tolerance. Compression ratio checked using Whistler and cubic inches checked using pump, OR by visual inspection, such as part/casting numbers and flat top or dish pistons (track option which method is used). Flat top or dish pistons only, no gas ported pistons. OEM or OEM replacement steel crankshaft only – cannot be lightened (no aerowing, bullnose, knife edge or undercut allowed. Effective January 1, 2011, no drilling of second or third rod throws). OEM or OEM replacement steel rods only – GM 5.7 or 6-inch rod allowed. Cap screws allowed. Cylinder heads must be unaltered approved OEM and minimum 76 cc combustion chamber. Only GM OEM approved head numbers are: 14079267, 3986336, 3986339, 3986339X, 3986388, 3932441, 376445, 3928454, 3932454, 3876487, 3973487, 3973487X, 3973493, 3951598, 468642, 330862, 333882, 3998920, 3998991, 3998993, 3998997, 3970126 or may use Engine Quest (EQ) Stock Replacement (SR) cylinder head, part number CH350I, head must remain as produced, seat angle valve sizes can not be changed; three angle valve job only (absolutely no casting removal in valve pocket of EQ head, for any reason); Ford - no after market or SVO heads; Chrysler - no after market or W-2 heads, 360 cubic inch heads only. No porting, polishing or alterations of any kind to heads or intake, disqualification and $250 fine if illegal. Must use unaltered OEM cast iron two barrel intake. No hi-rise or marine intake manifolds. Flat tappet cam/lifters only. No mushroom lifters. Cannot alter lifter bores. OEM non-roller rocker arms only GM - 1.250 inch maximum O.D. valve spring,. No beehive valve springs allowed. Guide plates and screw-in shouldered studs (0.375 inch max) allowed. No stud girdles. Poly locks allowed. Unaltered OEM type harmonic balancer only. OEM firing order cannot be changed. OEM type steel or aluminum water pumps only. ‘Wet’ sump oiling system only. Racing oil pans allowed.Mandatory one inch inspection hole in all oil pans no obstructions to crank and rods. Accumulator allowed, must be mounted under hood.
27. EIRI: (Except in rare instances) Decisions of officials are final and binding without exception. In some cases, track safety rules may take precedence over these rules - any discrepancy between these and track rules should be brought to the attention of Riviera management. Any rule changes or clarifications during the course of the year will be amended at the track or on dirtdrivers.com and be considered as an official part of rules
Street Stock -
1)SAFETY EQUIPMENT: Rules
2. FRAME: Any American OEM full body rear wheel drive passenger car, 1964 or newer, full frame or unibody. Minimum 107.5 inch wheelbase, maximum one inch difference from side to side. Frame must match body — GM to GM, Ford to Ford, Chrysler to Chrysler — AND wheelbase to wheelbase. Exceptions are: 1980 or newer Ford two door unibody may be installed on 1978-1987 GM full frame OR Ford full frame (shortened to minimum 107.5 inch wheelbase). Chrysler engine may be put in 1978-1987 GM full frame. Rear of frame behind rear
3. ROLL CAGE: Roll cage must meet IMCA specifications. Main cage must consist of continuous hoops, minimum 1.75 inch O.D. tubing, with a minimum wall thickness of 0.095 inch, low carbon or mild steel recommended. Four-post roll cage required, front down bars and rear hoop must be welded to OEM frame. Driver’s head must not protrude outside cage with helmet on. Rear hoop must have “X” brace, consisting of one full horizontal and one full diagonal bar, minimum 1.25 inch O.D. with 0.083 inch wall thickness. Front down bars must be tied together, passenger side front down bars must be maximum 11 inches in from top of door. Must be minimum 40 inches between outside edge of front and rear down bars at top of door panel. Maximum 41 inches (48 inches for 1988-1996 GM bodies) from top center of windshield to front edge of rear hoop; maximum 13 inches (20 inches for 1988-1996 GM bodies) to front edge of top halo. Top halo must be minimum 40 inches across, outside to outside. Rear hoop may be maximum 12 inches in from bottom of opera window. Minimum one cross bar in top halo. May have maximum two horizontal bars, (in addition to bar tying front frame horns together) for radiator protection; must be behind bumper, within confines of body, no wider than stock frame horns. Required rear kickers (down bars) and engine hoop must be minimum 1.25 inch OD tubing, with 0.083 inch wall thickness. Fuel cell protection required, must be mounted frame rail to frame rail, no higher than fuel cell, inside trunk area with maximum 1.75 inch OD tubing. All bars must be inside body. Foot protection bar required.
4. DOOR BARS: All door bars and uprights must be minimum 1.75 inch O.D. with 0.095 inch wall thickness. Minimum three door bars, both sides, parallel to ground, and perpendicular to driver. Minimum four uprights tied from frame to top door bar on driver side, and minimum three uprights on passenger side. Steel door plates, 18 gauge or 0.049 inch minimum thickness, must be securely welded to outside of door bars on driver’s side. Plate must cover area from top door bar to frame and from rear down post to five inches in front of seat. Must be visible for inspection.
5. BODY: Must be IMCA approved, unaltered OEM, and centered over wheel wells (front to rear and side to side). Body and engine make must match. Front body mounts must be visible. May use 1988-1996 Cutlass, Grand Prix, Lumina, Regal or Monte Carlo body on 1978-1987 GM 108 inch wheelbase full frame. Sunroofs and T-tops must be enclosed. OEM or aftermarket plastic nose and tail pieces allowed (recommended to match body). All body panels may be gutted, including fenders, doors, hood, roof, quarters and trunk, but must remain original size. No overlapping or shortening of body panels. Hood must be separate from fenders, in OEM location, with rear sealed off from driver compartment with metal. All inner wheel wells may be removed. Rear edge of trunk may be trimmed and rear tail light support removed only if aftermarket tail piece is used. Trunk floor must be removed over rear end housing, entire trunk floor may be removed. All windows must remain open, except opera windows may be covered with clear lexan, no decals. All ‘B’ pillars may be trimmed to minimum 2 inch width, must remain within OEM location. Maximum seven inch metal sun visor may be added to top of windshield opening. Wheel wells may be trimmed for tire clearance. No spoilers, hood scoops or reflective body panels. Rocker skirt/flare allowed between tires only, cannot extend outside tires, minimum 4 inch ground clearance.
6. DRIVER COMPARTMENT: Minimum of three windshield bars in front of driver. Aluminum high-back seat only, must be bolted in using minimum 0.375 inch bolts. Seat must remain inside all confines of roll cage. Driver must be sealed off from track, driveline, engine and fuel cell. Kick and rocker panels may be removed. Front OEM firewall may be replaced using steel fabricated firewall, 18 gauge or minimum 0.049 inch thickness. Top of firewall can be no further back than 12 inches from the back of engine block, measured horizontally. Bottom of firewall can be no further back than rear of oval body mount frame hole. Dash must not extend more than 24 inches back from top of firewall. Dash must be flat, rear can be no higher than front, except for cowl in front of driver. OEM floor pan may be replaced using steel fabricated floor pan, 18 gauge or minimum 0.049 inch thickness, securely welded to frame. Floor pan may be replaced from front firewall to rear halo supports. Must remain flat/OEM appearing from frame rail to frame rail, can be no higher or lower than frame rail. Exception is maximum 8-inch tall driveshaft tunnel. Tunnel must remain similar to OEM tunnel in size. No cockpits, interior must remain open. Rear firewall may be aluminum or steel and may be located no further forward than rear halo supports and no higher than bottom of rear opera windows. All holes in firewalls must be covered with metal. No driver-adjustable devices allowed while car is in competition except brake adjuster. No mirrors. 7. FRONT SUSPENSION: All components and mounts must be steel, unaltered OEM, in OEM location and match frame. Rubber, nylon or steel lower A-frame bushings only - no offset or bearing type. No sway bars. Exceptions are: weight jacks allowed - must be in original centerline of spring tower; OEM upper A-frame mount may be moved or replaced with aftermarket steel non-adjustable mount matching upper A-frame bolt on design; OEM or OEM replacement ball joints allowed. For 1978-1987 GM mid-sized metric frame, OEM upper A-frame may be replaced using aftermarket upper A-frame, must display “IMCA approved” decal on top of rear tube of A-frame. Shock location may be moved and may go through center of aftermarket upper A-frame, but frame cannot be altered in any way. Single hole shock mounts only.
8. STEERING: No rack and pinion. All components must be steel, unaltered OEM, in OEM location and match frame. Exceptions are: bolt on spindle savers allowed, OEM steering column may be replaced with steel knuckles and steel steering shafts (collapsible recommended). Quick release required - steering quickener and steering wheel may be aluminum.
9. SHOCKS: One steel nonadjustable unaltered shock per wheel. No coil over, air, or remote reservoir shocks. No Schrader or bladder type valve allowed. No coil over eliminators. One or all shocks may be claimed per event for $50 each, counting as one claim on card, following shock claim procedures
10. SPRINGS: One steel spring per wheel only. All coil springs must be minimum 4.5 inches O.D. and non-progressive.
11. REAR SUSPENSION: All components and mounts must be steel, unaltered OEM, in OEM location, and match frame. No independent rear suspension. Rubber or nylon control arm bushings only, no offset or bearing type. Welded single-hole shock mounts only. Exceptions are: coil springs may be moved, but center line of axle tube can be no further forward than the front of spring, or no further back than rear of spring; shocks may be moved, but must remain behind housing; lower control arm mounts on rear end may have multiple holes (maximum of five) for adjustment.
12. REAR END: Any steel approved OEM passenger car or truck non-cambered rear end (housing and carrier) allowed. Safety hubs (floater) allowed. No sway/panhard bars. All components must be steel, exceptions are: lowering blocks, axle cap, and drive flange may be aluminum. No adjustable lowering blocks. Full steel spool, steel mini spool or welded rear end only. Steel axles only. No quick change devices. One piece drive flange only. No torque-dividing differentials. No scalloped ring gears.
13. BUMPERS/RUB RAILS: Maximum one inch wide by two inch tall steel or lexan rub rails allowed - bolted flush to body. Front and rear tow hooks mandatory. All front bumpers must be mounted minimum six inches from front frame horns. Steel bumper mounts only. No sharp edges allowed on bumpers, rub rails or bolts. One of two bumper options must be used and must be OEM height. Maximum 5” (inch) spoiler at the rear of trunk is allowed.
OEM: Bumpers not covered by plastic nose or tail piece must be complete, unaltered OEM, capped to fender with steel, welded or bolted. No bars past outside edge of body other than rub rails.
Aftermarket: Fabricated tubular bumpers allowed, but must be covered by plastic nose or tail piece and bent to fit with rounded ends. Main bumper bar must be minimum 1.5 inch O.D. (maximum two inch) with 0.083 inch (maximum 0.125 inch) wall thickness on front, and 1.75 inch O.D. with 0.120 inch wall thickness on rear. 14. TIRES/WHEELS: Must use either unaltered Hoosier Race tire, G60-15 with IMCA stamped on sidewall or a street DOT approved tire no larger than 70 series. No racing, recaps, or studded mud or snow tires are allowed. American Racer racing tires or maximum tire size 255 70R/15. . 6 1/2 inches wide on the ground for passenger car tires and must have DOT number on them. American Racer G60 (KK-704 Modified tire) will be allowed until further notice. No grooving, sipping, or softening of tires allowed. Grinding or buffing will be allowed however method will be closely scrutinized. You may use sandpaper up to and including 24 grit to remove the glaze on the top layer of the tires. When you are completed with sanding your tires, the edges of the tread blocks must remain the same as the edge of the block next to it. You will only be able to create the look of a worn tire, and not something of a different tire face appearance. (Example: no wavy tread pattern or deep grinding will be allowed.) Must pass Tech Inspectors approval. Method will be closely scrutinized. If you start the night out on the Hoosier, you must finish the night on Hoosiers, same rule goes for the street tire. No softening, conditioning, siping or grooving of tires. Only 8” steel or aluminum rims allowed. Spacer or offset wheel, or a combination of the two allowed, but cannot exceed two inches total offset per wheel. May use IMCA approved bead lock, on right rear only. External, steel bead lock only and it cannot make wheel any narrower than 8 inches and no wider than 8.75 inches. Steel bolts only. Outer foam or plastic mud cover allowed. Inner mud cover allowed on left rear only. No bleeder valves.
15. BRAKES: Steel, unaltered OEM, or unaltered OEM replacement, operative four wheel, drum or disc allowed. Front components must match frame and maintain minimum OEM dimensions for hubs/rotors and calipers, cannot be lightened. OEM diameter caliper pistons only. Bolt pattern may be changed. Larger studs allowed. Vented rotors only, no scalloped or ceramic coated rotors. Rear rotors may be aftermarket 0.810 inch thick (new). No floating brakes. No brake shut-off or pressure sensitive devices. One front to rear proportioning device allowed. Brake lines must be visible. Aftermarket pedal assembly allowed.
16. EXHAUST: Round tube headers only. All primary header tubes must enter directly into one collector at same point at end of header. Must remain dual exhaust, no crossover or “Y” pipes. No exhaust through body panels or fenders. No merge collectors.
17. FUEL SYSTEM: Mechanical OEM type push rod fuel pumps only. Racing fuel cell required, maximum 22 gallon, must be in minimum 20 gauge steel container. Must be securely fastened in trunk above top of rear frame rails, behind rear tires, no further forward than factory seam where rear frame rail can be replaced, with minimum two solid steel straps around entire cell, two inches wide and 0.125 inch thick. No fuel cells allowed over rear end housing. Metal firewall must be between driver and fuel cell. All cell mounts must be steel, securely welded to frame/cage. No adjustable fuel cell mounts. Fuel cell vents, including cap vent, must have check valves. If fuel cell does not have aircraft style positive seal filler neck/cap system - a flapper, spring or ball type filler rollover valve is required. Fuel lines through driver compartment must run through metal pipe or metal conduit. One fuel filter only, cannot be in driver’s compartment. No cool cans. Air cleaner top/stud cannot direct air into carburetor. No top flow air cleaner housings, cold air boxes or air cleaner duct work.. Engine of 370 cubic inch and larger must run 2 bbl Holley #4412 500 CFM model with only the following alterations: Adapter plate and/or spacer & gaskets may not exceed 1-1/2 inches. Alteration may include: Choke plate may be removed. Choke housing must remain in place, Jets and power valves may be changed, No vacuum leaks between air cleaner and intake valves, Accelerator pump squirter may not extend into the area directly above the venturi. Unaltered cast intake or aluminum intake that measures 3.75 inches from the top of the block to the top of the intake for GM. Ford and Chrysler must measure 4.75 from the top of the block to the top of the intake (MAXIMUM). Maximum of one 1 inch spacer between the carburetor and air cleaner " sure seal ring" (for clearance purposes only) No Fuel injection, one carburetor only. Only one 14 inch by 4 inch thick round stock appearing air cleaner allowed. No carb hats, air boxes or other air flow devices are allowed. 18. FUEL: Gasoline only. Racing fuel allowed. No E85. No performance enhancing or scented additives. Fuel must pass both dielectric meter and chemical tests .
19. WEIGHT: No weights and/or loose objects in driver compartment or outside body and must not be visible. Weights must be securely mounted to frame or roll cage and painted white with car number on it. Must be attached with at least two 0.5 inch bolts. No titanium, magnesium or carbon fiber products. No gun-drilled, tubular, hollow bolts or studs. Steel fasteners only.
20. BATTERY/STARTER: One 12 volt battery only, must be securely mounted between frame rails, and positive terminal must be covered. Battery must be in Marine type case if mounted in driver compartment. Starter must bolt in OEM location. Car must have capability of starting without being pushed or pulled. Car must leave initial staging area on demand, unaided, or go to rear of that race.
21. GAUGES/ELECTRONICS: No unapproved cameras, transmitting or listening devices. No timing retard controls, or digital gauges (including tach). No electronic monitoring computer devices capable of storing or transmitting information except analog tach. No adjustable ignition control boxes. Only one 12 volt ignition box allowed, must be out of driver’s reach. No additional ignition accessories. Only change allowed to ignition box is one high-end rev-limiter. Setting can be changed through one chip only, or an internal setting inside box. No magnetos or crank triggers. OEM type alternator with internal regulator allowed. No electronic traction control devices (Refer to IMCA Operations and Inspection Manual or General Rules for automatic penalties).
22. TRANSMISSION/DRIVE SHAFT: Must have at least one forward gear and one reverse, plus neutral position. With motor running and car in still position, must be able to engage car in gear and move forward, then backward. Only OEM production type transmissions allowed - two speed, three speed, four speed and automatic. No five speed (or more) transmissions, “in and out” boxes, or quick change devices allowed. Functioning shift levers must be in OEM location. Flywheel/flexplate must be bolted directly to end of crankshaft, and pressure plate must be bolted directly to flywheel/flexplate. One flywheel/flexplate only, and all driveline components within bellhousing must rotate consistent with engine RPM while car is in any gear. Unaltered flexplate must be full OEM, or OEM replacement.
Manual: Must be OEM or OEM replacement case and have a working 7.25 inch minimum diameter, steel and/or aluminum, single or multi-disc clutch inside explosion-proof steel bellhousing - minimum 270 degrees around top of clutch/flywheel area.
Automatic: Must remain in OEM or OEM replacement case, with a functioning OEM appearing pump. Aluminum OEM bellhousing may be replaced with aftermarket explosion-proof aluminum bellhousing. Original OEM bellhousing must have approved scattershield constructed of minimum 0.125 inch by three inch steel, 270 degrees around flexplate. Manual bump starts allowed.
Drive Shaft: Must be steel and painted white. Steel slip-yokes only. 360-degree drive shaft loop required and must be constructed of at least 0.25 inch by two inch steel, or one inch tubing, mounted six inches back from front U-joint.
23. ENGINE COMPARTMENT: Engine must be in OEM location. On 1978-1987 GM frame and engine, center of GM fuel pump must be located minimum 1.75 inches in front of cross member (measured at frame). Engine setback on Ford and Chrysler engines in 1978-1987 GM frame TBA. Ford metric frames must have back of fuel pump in front of cross member. V-6 engine must be in OEM location. Frame and cross member may not be altered for GM engine placement. Engine mount holes cannot be removed or altered on block. Aftermarket engine mounts allowed, including mid-plate. Engine must be OEM appearing, must be able to be used in conventional passenger car without alteration. GM with GM, Ford with Ford, Chrysler with Chrysler (see exceptions). Radiator must be mounted in front of engine. Cooling system may be modified. Overflow tubes must be directed to ground.
24. ENGINE SPECIFICATIONS Engine of 370 cubic inch and larger must run 2 bbl 500 CFM Holly and must weigh no less than 3200 pounds. Engines 369 cubic inch and smaller may run any factory four barrel but no aftermarket racing type four Barrel. (Rule modified 2/21/2006) Cars with an engine 369 cubic inch or smaller may weigh 3000 pounds. All cars with an engine 370 cubic inches and larger must weigh no less than 3200 pounds. No roller cams or mushroom lifters Stock or roller rockers are optional. Screw in or pinned rocker studs allowed Heads must be cast iron. No roller camshafts allowed. No aluminum Heads allowed. 25. EIRI: (Except in rare instances
Hornets-- SPECIFIC HORNET RULES
This is an entry-level division. Any driver competing in any other division will not be eligible to compete in the hornet division. Unless otherwise noted, all parts on these cars are to be approved OEM. Age limit in this division will be set at 12. Must be that age before you can start, and the track reserves the right to remove any driver, of ANY age, if it feels danger is there.
1. BODY: Any front or any American made (ford, dodge, gm) rear wheel drive, compact car or
2. ROLL CAGE: Six-point, full perimeter roll cage required. Must use minimum 1.5 inch O.D. with 0.095 inch wall thickness tubing. Rear hoop must have “X” bracing configuration. Rear kickers required. Forward brace bar allowed from main cage to front strut tower. Brace bar allowed between strut towers in front and rear. No other bracing allowed on front end. Must have 1.25 inch minimum O.D. cross bar in top halo. Cage must be electric welded and attached using adequate plating (minimum 0.250 inch recommended). No iron, galvanized pipe or fittings, square tubing, brazing or soldering allowed.
3. DOOR BARS: Minimum three horizontal door bars on driver side and two horizontal door bars on passenger side. Both sides must have vertical bracing from top to bottom door bars. All tubing must be minimum 1.5 inch O.D. with 0.095 inch wall thickness.
4. DRIVER COMPARTMENT: Minimum three windshield bars and protective screen mounted in front of driver. Aluminum high-back racing seat required. Must be securely mounted to roll cage using 0.375 inch bolts. Driver must be sealed off from track, engine, transmission and fuel cell/tank. No mirrors. No gutting allowed except for roll/door bar clearance. All flammable material, radio and air bags must be removed. Front and rear firewalls must remain and have no holes. Interior must remain open.
5. SUSPENSION AND STEERING: All components and mounts must be unaltered, OEM and match year, make and model of car used. No weight jacks, modifications, racing components, aftermarket or homemade traction devices allowed. Rear wheels must track straight ahead and be in alignment with front wheels. No more than 5 degrees camber on any wheel. No center steering. Quick release steering wheel is allowed, must maintain OEM column. No aftermarket remote reservoir power steering.
6. SPRINGS/SHOCKS/STRUTS: All shocks and struts must remain OEM, in OEM location. Spring rubbers allowed.
7. TIRES AND WHEELS: OEM DOT 13, 14, 15 or 16 inch unaltered passenger tires only. No racing, mud or snow tires. No re-caps, softening, conditioning, grinding, sanding, siping or grooving allowed. Must be OEM steel or aluminum wheels, with standard bead bump and maximum seven inch width. All tires and wheels must be the same series, size and offset on each axle. Tires must be inside of body. No wheel spacers or bleeder valves. Reinforcing of wheels recommended. Must use one inch O.D. steel lug nuts on steel wheels.
8. BRAKES: Must be steel, unaltered, OEM operative, four wheel disc or drum brakes, and match year, make and model of car used. OEM master cylinder only, in OEM location. No brake shut off or bias adjuster. Steel brake lines only.
9. EXHAUST: Exhaust manifold must be unaltered, OEM for year, make and model of car used. Smog pump, catalytic converter and air conditioning compressor may be removed..
10. WEIGHT: No ballast (extra weight) of any kind allowed. Any item deemed as ballast will be required to be removed.
11. BATTERY/STARTER: One 12 volt battery only. Must be securely mounted with positive terminal covered. Battery must be in Marine type case if mounted in driver compartment. OEM starter only, must be in OEM location. Car must leave initial staging area on demand, unaided, or go to rear of that race.
12. GAUGES/ELECTRONICS: No unapproved cameras, transmitting or listening devices. 12 volt ignition system only. No ignition boxes. No performance chips. All ignition components must be unaltered, OEM and match year, make and model of car used. Aftermarket analog tach, oil pressure and water temp gauges only. Vehicle computer (ECU) should be mounted in accessible location for inspection.
13. FUEL SYSTEM: Must have complete, unaltered, OEM fuel system for year, make and model of car used. Gasoline only, maximum 93 octane. No E85. No performance additives. Gas tank ahead of rear axle allowed but must install shield under it. Gas tank behind rear axle must be replaced with maximum eight gallon fuel cell and relocated to trunk area. Must mount with minimum two solid steel straps around entire cell, two inches wide and 0.125 inch thick. Metal firewall or cell cover must be between driver and cell. Fuel cell vent, including cap vent, must have check valve. If racing fuel cell does not have aircraft style positive seal filler neck/cap system - a flapper, spring or ball type filler rollover valve is required. External electric fuel pump wired to the ignition switch allowed with aftermarket fuel cell. No cool cans. Fuel lines through driver compartment must be steel. Aftermarket fresh air pipe and air filter allowed, but no ram air.
14. TRANSMISSION: Must use OEM, unaltered transmission that came in year, make and model of car used. All forward and reverse gears must be operational. Flywheel, flexplate, clutch assembly and torque converter must be unaltered, OEM for year, make and model of car used. No mini clutches or couplers. Must have inspection hole in bell housing. No transmission coolers in driver compartment. No torque dividing final drive. No locked differentials.
15. ENGINE COMPARTMENT: Engine and radiator must be OEM, in OEM location for year, make and model of car used. May use solid engine mounts or safety chains. No accumulators/accusumps.
16. ENGINE: 3 or 4 cylinder in-line engines only. All engine components must be unaltered OEM for year, make and model of car used. Must use OEM crank, rods, valve sizes, stroke, etc. No aftermarket racing heads. No high performance or sports car engines of any kind. No turbo charged, super charged, rotary engines, or engines utilizing variable cam-timing.
17. VEHICLE IDENTIFICATION NUMBER (V.I.N.): The V.I.N. must remain clearly visible and unaltered in at least one of the OEM locations. Any car missing the V.I.N. will not be allowed to compete.
Late Models :
1.) ENGINE : NO aluminum blocks or titanium engine parts, except valve spring retainers, are allowed. All engine casting numbers stamped on the engine will be left on the block at the bell housing area. NO welding, grinding, or lightening of engine blocks, or epoxying of block numbers will be allowed. Block numbers will be stamped by the tech inspector if needed. The specified (spec.) head will be the G.M. bowtie cylinder head, part number 10134392, 14011058 or 12480034 casting number 14011034 and Ford M-6049-N351. The Mopar/Chrysler spec head part numbers are P5249769 (cast. # 4532693) and P4529446. The only Chrysler “R” block that will be allowed is # 4876791AB. No modification, except surfacing and three angle valve job. Angle milling of heads allowed. OEM tolerances only. Maximum valve size for all engines is 1.60” exhaust and 2.055” intake. Engines must have the following specified maximum stroke: GM 3.48”, Ford 3.50” and Mopar 3.578”. The maximum bore for any engine is 4.063, NO TOLERENCE!!”. Crank and rod assy. must be steel. Stock or roller rocker arms optional. No stud girdles. Screw in or pinned rocker studs are allowed. Flat tappet lifters only. Must be 100% steel. No roller, mushroom or radial lifters. GM may change to Ford lifter size (.874) only. No shaft mounted rocker arms allowed for G.M.or Ford products. No roller cams, no roller bearings for cam or crankshaft allowed. No external oil pumps, Barnes type pumps (wet pump feeding an external tank) or dry sump systems allowed. No engine may have more than 11.0:1 compression ratio. FLAT TOP PISTONS ONLY! Engine must be self-starting. Battery operated ignitions only, no magnetos. Must use only one 12v, 6 cell standard production design battery. Only one battery per car, used for both starting and ignition systems. Master battery disconnect switch is highly recommended. Electronic ignition systems are permitted but must be mounted in stock location. No crank triggered ignitions, MSD 6A, 6AL or 6ALN, 6T OR 6AN ignition box only. Only one box per car mounted out of the driver’s reach. Only one high end RPM limiter chip may be used. Riviera Raceway reserves the right to exchange ignition boxes at any time. May run engine under the I80 crate motor rules. Must conform to all I80 rules including rev limiter chip, wheels, and weight, to name a few.
· 2.) ENGINE LOCATION All competing models are allowed a maximum engine set back of 8" to be measured from the center of the forward most spark plug hole to the center of the upper ball joint. All engines must be mounted so that the crankshaft is within 2 1/2" of the centerline of the fixed upper ball joints.
· 3.) INTAKE AND EXHAUST – Riviera Raceway reserves the right to exchange intakes at any time. SPEC. INTAKE - The following intake manifolds, stock and untouched, will be mandatory on all engines. GM / CHEVY Edelbrock Torker II # 5001or # 2101 Performer. FORD WINDSOR Edelbrock Torker II # 5081or # 2181 Performer. MOPAR / CHRYSLER P5249572 or P5249572AB. Intake mounting bolt holes may be cut to match block deck angle only. See rule 1(D). Round tube headers only. All primary tubes must enter directly into one collector at the same point at the end of the header. Must remain dual exhaust, no crossover or ‘Tri-Y’ pipes. No exhaust through body panels or fenders. No 180 degree headers. No zoomies or side exhaust allowed. All competing cars are required to use a Yellow Jacket, Schoenfeld, or similar collector type muffler, fastened to the collector to reduce exhaust noise to 98 DBA at 100 feet, minimum.
· 4.) FUEL SYSTEM – Riviera Raceway reserves the right to exchange carbs with any Grand National competitor. The only acceptable carb for the Grand National class will be the Holley 4412, with only the following alterations: Choke plate may be removed. Choke housing MUST remain in place. Jets and power valve may be changed. NO DIAL -A -JET. No vacuum leaks between air cleaner and cylinder head valves. Adapter and/or spacer and gasket may not exceed 1 1/2 ". Carb must be mounted in stock configuration (carb fuel bowl facing front). All carb spacers/adapters must be approved by track tech officials prior to use. Only one round stock appearing top and bottom air cleaner may be used. Maximum size will be 14" diameter by 4" thick. Air filter must be in place at all times. No carb hats or other airflow devices will be allowed. No air boxes. No spacer will be allowed between bottom of air cleaner and carburetor. The accelerator pump squirter may not extend into the area directly above the venturi (tech purposes) Commercially manufactured fuel cells mandatory. Maximum capacity is 32 gallons, including fill spout. 22 gallon or less fuel cells are highly recommended. Fuel pick up/vent lines must enter/exit the top center area of fuel cell. No side or bottom mounted pick-ups. All fuel lines must meet or exceed Aeroquip FC300 specifications and use the proper fittings for the application, including fuel and oil pressure gauges if used. Vent line must have a rollover check valve. No vented fuel caps. (Plug or weld existing hole in cap) Fuel cell cannot extend below bottom of rear end. All fuel cells must be encased in a steel container 18-gauge minimum. All cells must be secured to the frame of the car and must be mounted in framework. 2” x 1/8” steel strap or 1” square tubing per the body diagram page is mandatory. All cars must be equipped with a fuel cell guard that is mounted separate of the fuel cell and mounted securely to the frame of the car. Fuel cell guard must be made of at least 1 1/2 " tubing and must extended to the bottom of the fuel cell. Mechanical fuel pumps only, mounted in stock location on engine. No electric fuel pumps. No belt driven fuel pumps allowed.
· 5.) CLUTCH AND BELL HOUSING : Flywheel must bolt directly to the crankshaft flange and rotate at engine RPM. High speed multiple-disc clutches are permitted. All cars must be able to get in and out of gear with the engine running and standing still. All competing models must be equipped with a flywheel and an operable starter. All cars with external clutch must have a steel explosion proof bell housing or an aluminum bellhousing with a 4" x 1/8 " 270 degree steel scatter shield around the clutch.
· 6.) TRANSMISSIONS and REAR ENDS: All Transmissions must be track approved prior to competition. O.E.M. production 3 or 4 speed transmissions that are cataloged through dealer channels will be permitted. All transmissions must have at least 2 speeds forward, and reverse in working order at all times. All transmissions must bolt directly to the rear of the bell housing. Steel drive shafts and universal joints ONLY, 2” minimum outside diameter. All drive shafts must be painted white. All cars must have a 360 degree hoop toward the front of drive shaft, made of at least 1/4" by 2" steel strap. Quick change rear ends are optional. All rear ends, regardless of manufacturer, must be locked or use a steel or aluminum spool. Full floating rear ends are mandatory. Rear coolers may be used, but cannot be mounted inside the driver's compartment. No open tube rear ends allowed. No cambered rear ends permitted. The rear tread width can be no wider than the front tread. The rear tread width offset can not extend beyond the front tread width either side.
· 7.) COOLING: Water pumps must be of stock design, aluminum or steel allowed. Water pump to be mounted in stock location. No electric water pumps. Only one radiator for the purpose of engine cooling mounted in standard location. Cooling fan must be mounted to water pump, enclosed in a 360 degree metal fan shroud. Overflow tube must exit toward the ground.
· 8.) CHASSIS: The minimum wheelbase is 103" average both sides NO TOLERANCE. Rear suspension configuration is optional, but no devices allowed of any kind that are designed to change the wheel base, or weight jacking of the car while in competition will be permitted. Control arms with rubber bushings are not permitted on the rear of the racecar. All front suspensions must be of A frame type. Rotors or brake drums must be made of steel. No ceramic or any other coating permitted on surface of rotors or brake drums. No plastic or nylon brake lines allowed. Flexible lines from frame to caliper or rear end must be steel braided or have steel braided reinforcement. No ceramic or carbon fiber parts allowed anywhere on the racecar. No traction control devices of any kind allowed. No carbon fiber or composite parts will be allowed anywhere on race car. Only part that can be is front piece of roof. Only one shock and steel spring per wheel. One limiting device on left rear only. No remote reservoir shocks will be allowed on any corner of the suspension. NO SCHRADER VALVE OR GAS RELIEF/REFILL PORTS.
· 9.) ROLLCAGE: All main cage and door bars must be 1 1/2" O.D. X .083 wall minimum. All cars are required to use a roll cage with at least 3 horizontal bars across the driver’s door. All cars will be required to have a vent window bar, 1 ½” OD, a maximum of six inches in front the halo bar at a right angle to the door bars and a bar in the center of the roll cage over the drivers head, or roof bar from left front windshield bar to the right main roll cage hoop. All cars will be required to have a bar for the purpose of protecting the driver's feet. All batteries must be mounted between the frame rails and ahead of the fuel cell, NOT in the driver’s compartment. All battery cables and battery cable ends must have a non-conductive covering to prevent electrical shorts. No mirrors permitted.
· 10.) BODY (See diagram on last page): Bodies must be mounted similar to stock appearing. All cars will have a stock appearing nose, maximum width of 72". No wedge noses. The length measurement of the nosepiece for all models will be 45" from the center of hub to front edge of nose. The maximum width of flare in front of the front tires is 84". No bars in front of the nose panel. Rear deck height maximum 37" ground to deck. All competing makes and models will have a maximum rear spoiler material height of 8" and width of 72". All spoiler measurements will be made from the deck and will be a measurement of all spoiler material. All competing models will be permitted to use 3 spoiler braces. No other fins allowed on deck area. All spoiler braces will be required to be no higher than 3" at the front of the base and can be no higher or extend rearward past the rear spoiler. Spoiler braces may be 18” at the base. Braces may have 1/2" break. Clear Lexan rear spoilers are highly recommended. Braces must be the same as the attached body diagram drawing. Left and right side roof panels must be the same length and design. Roofs may be made of fiberglass, steel or aluminum, but must meet specifications as set forth in rules, and must be approved by the officials. All roof panels must have front mounting posts and rear roof panels. Rear roof panel windows must remain open per the body specs. Rear roof panels must extend to the quarter panels on both sides. Roof escape hatches, hinged in front, are highly recommended . All cars must have minimum 12” window opening, driver’s side and passenger side. A protective screen is required on the driver’s side, supported by a minimum of 3 equally spaced braces. Drivers cowl (mud deflector strip) may not extend past the steering wheel. (Nothing above/on the deck.)
· 11.) WEIGHT: All competing models running 12” and 14”wheels must weigh 2350 pounds after the race, with driver and will be adjusted accordingly if needed. Weight for 1mca spec engines is still to be determined, thinking 2550
· 12.) TIRES and WHEELS: The track tire will be Hoosier WRS 2 D-55 LBS 11.0/88, 11.0/90 or 11.0/92 and may be used on all four wheels. No softening, siping or grooving. Tires must be stock, no alterations. May use 24 grit sandpaper only to break glaze. Tires will be subject to durometer testing which will be 60 cold and 55 hot at any time. Only steel or aluminum wheels will be permitted. May run either a 12” or 14” wheel. (see weight rule above).Bead lock wheel is allowed 3/4" more. Bead lock wheels may be used on all four corners of the car . Foam mud plugs are strongly recommended.
· 13.) CAR PROTEST RULES: All race protests must be placed with a tech official in writing no later than 5 minutes after the A feature The protest fee is $100, $150 to pull one head, only one item may be protested per event and must be given to an official along with the written protest. The car in protest will be checked after the main event. If the car in protest is found illegal, it will lose all points and money for that night and protester will be returned his/her $100. If the car is found to be legal, the $100 is given to the car in protest. Drivers only may make a protest and must have competed in the “A” feature. Track officials have the right to inspect any car at any time at no charge. Track officials have right to reject any protest. Serious technical violations will result in the same penalties as a claim refusal. Illegal parts will be marked and kept by the track.
· 14. FUEL: Gasoline only. No performance enhancing additives or pressurized fuel systems. Fuel must pass both dielectric meter and chemical tests for additives. Fuel sample may be taken from any car at any tim 15.) APPEARANCE and NUMBERS: All cars must have bright paint jobs and bright numbers. No tape, shoe polish or metallic tape can be used for numbers. Numbers colors must contrast with the body color, preferably with a high contrast outline. Dark colors are not recommended. Different color paint on each side of the race car is not recommended. All cars must be properly cleaned and washed before each night of racing. We strongly suggest that numbering and lettering be done by a sign painter or professional, as it makes your car look much better and more like a race car. Grand National car numbers must be 24" tall and 3" wide, and located on both sides of the car. An 18" tall roof number with the base of the number on passenger side of roof. A number plate at least 6" square with number painted on, affixed to the windshield area so as not to obstruct vision, is highly recommended. Plate may be hinged or solid mount.
· 16.) SAFETY & GENERAL RULES: All drivers must wear an approved, Snell SA2000 or SA2005 full-face safety helmet (no open face helmets), and fire retardant racing gloves at all times when the car is on the track. Solid center steering wheels are highly recommended. Neck brace or similar approved head restraint devices are mandatory. All cars must have seat belts and shoulder harness securely fastened to the frame or roll bar. They must be of the approved racing type with quick release aircraft type hookups. No stock type seat belts allowed. Shoulder belts must be 3" wide and 2" wide lap crotch strap. Shoulder harness must be securely mounted to the roll cage no higher than TWO inches above shoulder level. Sternum straps are highly recommended. Firesuits of at least a fire retardant material are mandatory. (SFI-5 is the recommended minimum.) Used suits will be subject to approval by track officials. Sleeves must be rolled down. Nomex underwear is highly recommended, including hood and socks. Race approved footwear (leather shoes) are highly recommended. All roll bars within the driver’s area must be padded. All cars are required to use a window net in the driver's door window. Arm restraints highly recommended. Ballast (extra weight) added to the car for weight rule conformance must consider all provisions of safety and must be securely fastened. Ballast must be bolted to the frame or cage only. No ballast may be mounted above the interior deck to rub rails or body mounts. Any ballast weight over 25# must be drilled and mounted with two 1/2" studs through each weight. No ballast blocks less than 5 lbs nor more than 60# will be allowed. No stacking of ballast. Ballast must be painted white and stamped with your car number (this is a maintenance item and must be maintained all year). A fire extinguisher, in working order and up to date, will be required in your race car. No transmitting or listening devices in car. No electronic monitoring computer devices capable of storing or transmitting information except tach allowed on car. No electronic or mechanical traction control devices allowed. No digital gauges or tachometers allowed.
IMCA SPEC ENGINE RULES(A) Steel blocks only.
(B) Maximum 361 c.i. (GM), 362 c.i. (Ford) 364 c.i. (Chrysler). Minimum four-inch bore. Minimum stroke: GM - 3.48 inch, Ford - 3.40 inch, Chrysler - 3.313 inch.
(C) Maximum compression - 10.5 to 1, checked at any time with Whistler. No tolerance.
(D) Brodix/IMCA spec cylinder heads only. No grinding, polishing or altering of any kind. No use of any substance that may change or alter shape or size of ports, runners or combustion chambers. Only alteration allowed to heads are for push rod clearance and to install shaft rocker system. Maximum valve sizes are 2.08 intake and 1.600 exhaust. Valve seats and guides to remain as manufactured and in as-cast positions. Minimum combustion chamber size to be 62 cc volume. Valve angle to remain as manufactured. Approved cylinder heads as follows:
• General Motors (i.e. small block Chevrolet) - Brodix # 46 221
• Ford Motor Company (i.e. small block Windsor) Brodix #46 223
• Chrysler Corporation - Mopar - Brodix #46 222
(E) No modification to intake manifolds, must be used as produced by manufacturer. List of approved intakes as follows:
• General Motors - Brodix #HV100946
• Ford Motor Company -Edelbrock #2981 or 2980 (351) or #2921 (302)
• Chrysler Corporation- Edelbrock #2915
(F) Camshafts may be of roller, flat tappet or mushroom design.
(G) Crankshafts and connecting rods must be steel. One inch inspection hole required in pan - no obstructions to crank and rods. If obstructions are present, must remove pan for inspection.
(H) Flat top pistons only. (I) Will follow Norfolk Limited Latemodel 2-barrel carburetor rules. (J) The spec engine option will follow all the Norfolk limited late model rules and will be adjusted accordingly if needed. CRATE LATEMODEL RULES SECTION 1: CRATE ENGINE RULES A. The following engines will be legal at Riviera Raceway: GM crate engine # 88958602 and GM crate engine #88958604. The Ford and Dodge crate motor numbers have not yet been determined. B. Engines may be interchanged within manufacturer’s lines. C. All competing models are allowed a maximum engine set back of 8 inches to be measured from the center of the forward most spark plug hole to the center of the upper ball joint. D. May run any 2 barrel carburetor up to 500 c.f.m. or any 4 barrel carburetor up to 850 c.f.m. carburetor. E. All carburetors are subject to a claim rule of $500.00 for either a 2 barrel or 4 barrel carburetor. F. Gasoline can be premium grade unleaded pump gas or a spec racing fuel to be announced. No alcohol, ethanol or oxygen bearing additives allowed. G. There may be weight breaks given or weight added depending on the horsepower of the crate engine manufacturer (GM, Ford, and Dodge) engine that is used or at the discretion of the Riviera Raceway officials. H. All engine casting numbers stamped on the engine will be left on the block at the bell housing area. I. No epoxying of block numbers will be allowed. Block numbers will be stamped by inspector if needed. J. The engine block must retain all standard external dimensions with the exception of the maximum allowable overbore and the surfacing of the block deck. Angle cutting of the block deck will not be permitted. All dimensions will be determined by GM, Ford or Dodge crate motor manufacturers and Riviera Raceway tech officials. Riviera Raceway officials will provide competitors with a list of dealers in your area that sell the GM, Ford or Dodge crate engine. After you purchase an engine from the GM, Ford or Dodge dealer, engine is required to be taken to the dyno shop of an approved Riviera Raceway engine builder. Riviera Raceway will have multiple engine builder choices that have a dyno shop where engine may be taken. . K. Riviera Raceway has the right to impound the crate engine of any competitor at any time and have that engine re-dynoed. Horsepower ratings must be within 15 horsepower of original dyno sheet received from dyno shop after original engine purchase (or most recent rebuild). If there is a greater than 15 horsepower increase, or the engine has non-approved modifications, the engine may be confiscated. L. Any driver who purchases a crate engine, and chooses not to dyno it and get a serial number from the track, will have their engine pulled apart at the track for inspection. M. Anyone found altering or attempting to increase a crate engines performance will be fined as follows: $1,000 driver and $1,000 owner or $2,000 if owner and driver are same person. Fines must be paid to Riviera Raceway before driver and owner will be allowed to return and race at Riviera Raceway. On the second offense, fine will be $2,500 driver and $2,500 owner or $5,000 if owner and driver are same person PLUS a one calendar year suspension. N. The crate latemodel engine option will follow all the Norfolk limited late model rules and will be adjusted accordingly if needed.
SECTION 2: INTAKE MANIFOLDS SPACER PLATES, AND IGNITION SYSTEMS A. A spacer plate may be used between the carburetor and the intake. May be a one hole or 4-hole spacer plate with NO Taper, with nothing inside of the spacer plate to enhance or increase the airflow to the engine. Maximum 1-inch thick spacer on GM crate engine #88958604. Maximum two-inch open plastic spacer allowed for GM crate engine #88958602 B. HEI and MSD ignition systems only and must be connected to a 6200 RPM rev limiting chip or module. No crank triggered ignitions. The following MSD #’s are allowed: P/N 8728, MSD Soft Touch Rev Control, is designed to be used on standard points ignition or inductive ignition systems. This means that the PN8728 can be installed on engines with a GM HEI Ignition, Ford or Chrysler electronic ignition and any standard breaker points system without an MSD box. P/N 8738 MSD Soft Touch Rev Control for use with MSD 6T, 6TN Ignition Boxes. P/N 6420 MSD 6AL Ignition Control Box with Rev Limiter Built-In. P/N 6430, MSD 6 ALN Ignition Control Box with Rev Limiter Built-In. MSD boxes must be out of reach of driver and accessible for tech. (Note: In 2008 the MSD 6AL, P/N 6420 may be the preferred MSD box for all crate engine cars. If you are buying a new or used MSD box you may want to consider this.)
· NOTE: The race director shall be empowered to permit reasonable and appropriate deviation from any of the specifications herein or impose any further restrictions that in his/her opinion do not alter the minimum acceptable requirements. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM SUCH ALTERATION OF SPECIFICATIONS. Any interpretation or deviation of these rules is left to the discretion of officials. Their decision is final.