Stock Car Rules

1. COMPETING MODELS: Open to any passenger car or 2-WD light duty pickup truck from 1960 - present date. No jeeps, corvettes, convertibles, citations, vegas, corvairs, folcons, gremlins, monza types, 4-WD's, sports cars, or compact cars. Vehicles not covered under these exclusions do not mean they are pure stock material. Consult tech inspector as to the legality of the vehicle before building. Some models may not be included in the above exclusions. To avoid disappointment and expense, please check with us before you build a car.

 

2. ROLL CAGE: NO OFFSET CAGES. Must be minimum 1-1/2" outside diameter (1/8" wall thickness highly recommended), no soft metals (aluminum, etc.) allowed. Mandatory six-point cage must surround the driver with uprights mounted on the right and left sides of the frame behind the driver, one on each side. There are several allowable variations to this basic design, which are subject to the discretion of the technical inspector. His decision is final. The four bars joining the four uprights in a horizontal plane above the driver's head must be at least two inches above helmet height of the driver when strapped in the car/truck. The front down tubes must be no further than 11-1/2" back from the front body mount and must extend to the front of the top roll cage. There must be at least three horizontal bars on both sides of the car connecting the uprights on the driver's side of the car in the door cavity and at least one bar must be extended to the outer door skin for added driver protection. These bars must have at least one set of vertical supports between the uprights. There must be at least three horizontal bars connecting the uprights on the passenger side of the car with vertical supports between the uprights. The right and left uprights in front of the driver must be connected with at least one horizontal bar at dash height. Additional diagonal support bar on left side of chassis from top front of cage down to side. These are minimum allowable bar requirements and of course more are preferred. All junctions of two or more tubes in the cage must be gusseted for additional strength with at least 1/8" plate steel gussets. Threaded pipe, pipe fittings, lap weld pipe, soft metals like aluminum, angle or channel iron, and flush grinding of welds are not permitted.

 

3. SEAT: All cars must be equipped with a safe racing seat, high back type recommended. Seat must be securely fastened (bolted or welded) to the roll cage and/or frame in six spots, with a minimum of six 3/8" bolts. Four (4) on the bottom and two(2) on the seat back. NO FLOORBOARD INSTALLATIONS. The seat must be positioned completely to the left of the centerline of the car (no center steering) on the driver's side. A functional padded headrest must be in line with center of driver's head if not built into seat. NO SET BACK SEATS. NO FIBERGLASS SEATS.

 

4. WINDOW SCREEN: All cars must have a full steel wind screen of substantial material with a maximum opening on individual holes at 1 x 1 (minimum 16 gauge material) (no chicken wire or aluminum) and be reinforced by a minimum of three (3) steel bars connected to the roll cage on top and the dash support bar on the bottom (cold roll). Screen must cover entire windshield area left to right across the cage and from top of cage down to hood or cowl. Side window net is highly recommended.

 

5. FRONT AND REAR FIREWALLS: STEEL ONLY REAR firewall must extend from bottom of window down to floorboards. FRONT FIREWALL MUST BE STOCK and have all holes securely covered (sheet metaled over) to isolate driver from engine compartment. No tilting of firewall or altering of any kind.

6. FIRE EXTINGUISHER: All crews must carry an operable fire extinguisher capable of extinguishing gas and oil fires.

7. BATTERY: Battery may be located in any position. It must be enclosed in a six-sided metal box, which is securely fastened to the car with at least two (2) straps securing the box to the cage or frame - NOT to floorboards. RECOMMENDED: A battery master shut off switch that is mounted, marked, and easily accessible to the safety crew.

 

8. SWITCHES: All cars must have an ignition switch, which is easily accessible within the driver's compartment. The ignition switch should be labeled ON/OFF with bright colored paint for safety crew to recognize.

 

9. FUEL SHUT-OFF VALVE: Recommended. Within easy reach of driver. Shall be labeled ON/OFF with a bright colored paint for the safety crew to recognize.

 

10. FUEL & POWER STEERING LINES: All lines and fittings running through the driver's compartment must be of approved type. Any non-steel braided line must be enclosed in steel tubing. NO plastic or glass fuel filters allowed.

 

11. BRAKES: Operable and effective four-wheel hydraulic brakes mandatory at all times. No three wheel, left side, or shut off set-ups allowed. Speedway may conduct brake tests during the season. Rear disc brakes may be installed if that particular manufacturer had used them in production and providing that rotors, calipers, and mounting brackets are all stock OEM parts. The use of dual master cylinders with proportioning adjustment will not be allowed. Master cylinder may be of any style dual reservoir, single piston assembly.

12. WHEELS: Minimum five (5) oversized lug nuts per wheel. Wheels must be reinforced, STEEL ONLY. Recommended: Racing wheels and oversized studs. Maximum width 8", bead lock rims permitted on right rear only. Wheels must retain original bolt pattern on front hubs.

 

13. EXHAUST: Stock manifolds or headers. Exhaust termination must be behind the driver.

14. THROTTLE SPRINGS: Minimum two (2) required.

 

15. BODY: Must be stock appearing in stock location on frame. NO CHOPPING, CHANNELING, OR INTERCHANGING OF BODIES. NOTE: Ford on Ford, GM on GM, Chrysler on Chrysler, etc. It will be acceptable to use up to present date stock steel sheet metal bodies, or steel after market bodies providing they look stock and match up to the wheel base of the frame being used. ALL BODY PARTS MUST BE STEEL. No hood scoops or air induction systems. The officials reserve the right to reject any car that the body does not look or fit properly. NO FLAT SHEET METAL (must be like OEM fit). Full fenders only, with reasonable radius cut for tire clearance allowed. Inner fender panels may be removed if fender remains secure. Rear firewall and rear window shelf must seal off driver compartment from trunk area. No sheet metal going from passenger side dash back to rear shelf. Inner sheet metal must be stock appearing. The full factory stock floorboard must be retained from the engine firewall to the rear rear firewall, and from body side skin to side skin. Rusted floorboards must be securely sheet metaled over to stock configuration to seal off driver's compartment. Any holes in floorboards for shifter, etc. must be no larger than necessary to facilitate the shift pattern. Shifter boots are mandatory. No holes in hoods. Lift off hoods and trunks are allowed as long as stock sheet metal hoods and deck lids are retained and they are fastened safely to properly seal off engine and/or trunk area. All glass and plastic must be removed. NO EXTERNAL FENDER FLARES. NO OUTSIDE RUB RAILS. NO SPOILERS. Numbers must be 18" high on both doors and roof, and numbers must be easily readable to scorers. All cars must be neatly lettered and numbered. There will be no duplicate numbers. First car to register will have that number and all other cars will have one week to alter car's number.

 

16. FRAME: Must be the same as body manufacturer. Frame must be consistent with type of body, i.e., truck on truck frame, car on car frame. No interchanging. Uni-bodies may tie sub-frames together. If the ties extend through the car, the floor must be completely welded to the tie to seal off the driver's compartment. Frames may be repaired where needed but the stock frame rails must remain in stock location. Frame must be stock for year make and model. NO FRONT WHEEL DRIVE CHASSIS. NOTE: On uni-bodied cars only, a homemade frame may be constructed using steel rectangular tubing only with a minimum specification of 2" x 3" .120 wall thickness. The 3" dimension must be in a vertical position. If using this option it must start at rear of the front stock OEM sub-frame and continue all the way back to the front of the OEM rear sub-frame. Springs and locating bars for rear will be measured and compared to stock specifications for legality. The proper construction of this frame option on welds, cross members, roll cage and brace tie-ins will be up to the discretion of the officials. An X brace must be constructed to tie the frame rails together at the front cage loop, passing under the driver's seat.

 

17. STEERING: Steering column must remain in stock location right to left, front to back (cannot exceed 38") from fire wall to wheel hub. Steering quickeners are allowed. Quick release steering wheel highly recommended.

 

18. RADIATOR: Only one (1) per car. Must remain in front of the engine in stock location between frame rails. 25 lb. psi cap. recommended. Catch can mandatory. It is recommended to double clamp all hose connections.

 

19. ENGINE LOCATION: Must remain in stock location in chassis, left and right. Engine must be from the make chassis it is in. Engine set back, will be at its maximum and verified when the center of the number one spark plug hole, on all make engines (furthest cylinder forward) is in line with the cener of the top ball jont. No sliding motor mounts. NO CUTTING CROSS MEMBERS FOR FUEL PUMP CLEARANCE.

 

20. TRANSMISSION: Automatics must have working stock OEM torque converters with all gears working. Three and four speeds must have two (2) forward and one (1) reverse gears working and have stock OEM single clutch disc mounted in stock location. Steel flywheels only. No aluminum clutch parts. Stock flywheel diameter. NO DRILLING OR MACHINING for lightening purposes allowed. No over or under drives. No after market transmissions.

 

21. SCATTERSHIELD: Steel scattershields or steel scatterproof bell housings for standard transmission cars are recommended. Automatic transmission explosion blankets are highly recommended. ALL BELL HOUSINGS MUST HAVE HOLE DRILLED IN AT TOP TO INSPECT FLYWHEEL AND CONVERTER.

 

22. DRIVE SHAFT: Steel drive shaft only. Only steel drive flanges on rear and transmission. All cars must have a suitable drive shaft sling behind transmission, under front U-joint, in case of failure, to prevent drive shaft from digging into track or bouncing out or up into a car. The drive shaft must be painted white.

 

23. REAR END: Differential housing must be in stock location. Stock type rears only. Passenger car only. No truck or wide rears allowed. No floater or quick changes. Welded spiders or steel spool only. Limited slip not allowed. It is recommended that integral type rears with horseshoe clip holding axles in be tack-welded to prevent fall-out. No weight jackers. No adjustable rear leaf spring shackles. Rear end must be same as manufactured car. OPTIONAL: A Ford 9" rear may be installed in any chassis providing it utilizes all the same parts needed to hold in the rear end that was replaced. NOTE: It must be in the same location, front to back and be centered in chassis. Also, the same springing and positioning of springs that the chassis had in stock OEM form.

 

24. FRONT END: Must be stock type components and location (except shocks). No weight jackers.

 

25. WHEELBASE AND TREAD: Must maintain stock specifications for chassis. No wheel base setbacks. No rear end offsets. Maximum tread width, front and rear 80-1/2". Measured from outside of side walls. All cars must have a MINIMUM WHEEL BASE OF 105".

 

26. SUSPENSION: All parts must remain stock. All mounting locations must be stock. No light weight "A" arms etc. No interchanging of spindles.

 

27. SPRINGS: Must be original stock type and location (leaf for leaf, coil for coil, torsion bar for torsion bar). Stock sway bar allowed. No helper springs. Steel springs only. NO CARBON FIBER.

 

28. SHOCKS: No air shocks, coil over, load-levelers, etc. No air bags. No aluminum or adjustable shocks.

 

29. BRAKES: Operable and effective four-wheel hydraulic brakes mandatory at all times. No three wheel, left side, or shut off set-ups allowed. Speedway may conduct brake test during the season. Rear disc brakes may be installed if that particular model chassis had used them in production and providing that rotor and calipers and mounting brackets are all stock OEM parts. The use of dual master cylinders or adjustable proportioning valves will not be allowed. Master cylinder may be of any style dual reservoir, single piston assembly.

 

30. BUMPERS: Stock bumpers only. Front and rear, they may be securely reinforced under and at the ends of the splashguard in order to remain stock appearing. They must also be stock for the year, make and model. NO FACTORY HARD PLASTIC NOSES. After market are allowed.

 

31. FUEL TANK: FUEL CELL MANDATORY. Fuel cell height 12" minimum from ground to bottom of tank. Fuel cell must be fully encased in a steel container with a minimum thickness of 20 gauge. An optional aluminum container may be used with a minimum thickness of .060". Fuel cell must retain foam inside. Fuel lines must siphon from top only. Fuel tank vent line must have an in-line one-way valve for the prevention of fuel spillage. No auxiliary tanks. Fuel cells must meet FIA/SPEC/FT-3 Specification. Integral ball check valve highly recommended for filler neck and vent tube. Maximum 22 U.S. gallon must be located in the trunk area only. Must be square or rectangular in shape only. No access holes for filler neck. Trunk must have to be opened to re-fuel. All fuel lines and fittings must be leak proof. Gussets must be used where supports attach to the main frame rails. Two (2) skid rails must be installed under the fuel cell, running front to rear the entire width of the fuel cell with minimum 1/8" x 2" material. Cell must be securely strapped down by at least two 1/8" x 1" steel straps to existing supports by use of at least 5/16 grade 5 (3 line) bolts. Technical inspector can reject any fuel cell mounting he deems unsafe. NOTE: 32 gallon fuel cell may be used for events of longer duration.

 

32. BALLAST WEIGHT: If ballast weight is needed to make weight, it must be securely bolted to the inside of both frame rails and ahead of rear axle and be painted white and carry the car's number.

 

33. TIRES: When using passenger car tires,only DOT street radials are permitted, with a tread width no wider than 11". Hoosier brand racing tires permitted: H78-15 or J78-15 Super Dirt Stocker or Dirt Stocker, H60-15 or L60-15, Super dirt Bozz or Dirt Bozz, 27.5-8.0-15 or 26.5-8.0-15 RC4 or HTOV, P265-60-15 or P255-60-15 or P245-60-15 or P235-60-15 in SOFT or MED compounds; American Racer (McCreary) brand racing tires permitted: P265/60-15 or P265/60-15SH. After June 18 only specified American Racer tire allowed on right rear. See TIRE NOTE at end of rules.

 

34. WEIGHT: Minimum weight will be 2800# for spec. 358 engines or 3200# for non spec. 358 engines. Weight is with driver, at conclusion of heat or feature race. No titanium or carbon fiber parts permitted. THE TRACK SCALES ARE OFFICIAL.

 

35. ENGINE RULES:

A. Engine block and all internal parts must meet stock specification for its make. Bow-Tie or performance blocks not allowed. All engine parts must have casting or part numbers on them for identification. Flat top aluminum pistons only. Any make - no coatings.

B. CYLINDER HEADS: Only cylinder heads produced by Chevy, Chrysler, or Ford with their part and casting numbers approved by Speedway and pass the ball check will be eligible to run. Cast Iron OEM stock production only. Manufacturer of engine block must manufacture heads. Sand blasting, bead blasting, acid-etching, porting, polishing, and welding are prohibited. No relieving or unshrouding of valves in the combustion chamber. The Ford GT 40, Chevy bow-tie, Chrysler w-2, Ford performance, and GM Angle Plug heads will not be allowed. WORLD PRODUCT Part #4266 A or B and casting # IO52 or 1052 will be allowed. See special notes. Valve head sizes optional providing they maintain stock OEM positioning in valve guides (distance apart and angles). Valve guide liners will be allowed. Any angle valve job will be permitted as long as it is done on a machine that cuts concentric to the valve guide center. There will be no hand grinding, sanding, blending or deburring where a cutter or stone leaves off. The amount of metal you will be able to remove in the bowl areas on both intake and exhaust will be governed by the same method used by Speedway inspectors. Method of checking will be as follows: On the exhaust side the header will have to be removed and then the inspector will place a tool in the port which will consist of a .531" diameter ball bearing welded to a flexible shaft. With the valve fully opened the ball will be placed against the valve stem and moved to a full circle (3600) around the valve stem, if the ball drops down toward the valve seat in any position around the full circle of the valve stem, it will be deemed illegal. On the intake side the carburetor will have to be removed and in some cases the intake manifold for the same type of procedure, only the ball size will be .787. NOTE: These methods of checking the head will hold true with a hot or cold engine. Valve material must be 1 piece solid steel or stainless steel. No titanium, or sodium filled valves. NOTE: The only titanium allowed in these engines will be the valve spring retainers. Valve stem maximum and minimum diameter plus or minus .005" must be, Chevy 11/32" , Ford 11/32", Chrysler 3/8". No coating of heads. NOTE: Anyone found to be illegal in any way in the cylinder head area will result in complete disqualification, losing all moneys and points for the night. No protest or appeals will be given on cylinder head infraction.

C. CRANKSHAFT: Any steel or cast iron allowed providing it maintains stock stroke as manufactured for the engine block used. No light weight cut down, or narrowed crankshafts. No holes drilled through crank pin or any areas not done so by manufacturer. No Knife-edging.

 

D. RODS: OEM stock production or aftermarket solid steel only.

E. CAMSHAFT: Any make hydraulic or flat tappet allowed. NO roller cams. NO mushroom lifters. NO lash caps, or roller gear driven cams. Shaft rockers and stud girdles are not allowed. OEM rockers only. Engines with stock OEM shaft rockers are legal. Lifters must maintain stock OEM diameters. Lifter bores must remain in stock OEM positions and angles, but may be rebushed for wear.

F. IGNITION: Stock OEM distributors and coils only. NO trigger ignition systems. H.E.I. ignition, coils must remain in distributor if stock OEM. Only one coil will be allowed on a car. All cars must have the capability of starting wihout being pushed or pulled or they will go to the rear.

G. LUBRICATION SYSTEM: NO dry sump system, NO external oil pumps, NO accusumps allowed. Must be steel stock appearing pan with 3/4" inspection hole on left side of pan. Oil coolers permitted, providing they are mounted under the hood.

 

H. WATER PUMP: Radiator fan must be steel only. No electric cooling fans or pumps.

 

I. FUEL PUMP: Must remain in & be driven as stock OEM equipment. No electric pumps or glass bowl filters.

 

J. VIBRATION DAMPENERS: Must be any stock OEM, not machined or altered in any way. Steel or cast iron only. No aluminum dampeners.

 

K. FUEL: Gasoline ONLY. NO nitrous or any other additives.

 

L. SPEC. 358: Non-ported stock OEM heads and block only. NO 400 blocks.

Engines must remain stock as manufactured with the following exceptions:

1. Only North American passenger car V-8 manufactured engines allowed with a maximum displacement of 358 cu. in. plus 3 cu. in. wear allowance.

2. All engines must maintain stock bore and stroke combinations. Example: Chevy 350 cu. in., 4" bore x 3.480" stroke. Chrysler 340 cu. in. 4.040" bore x 3.313" stroke. Ford 351 cu. in. 4" bore x 3.5" stroke. Only .060" max overbore permitted.

3. Intake manifold must be cast iron 2 barrel stock passenger car only. NO porting, polishing, welding, matching or acid etching.

4. Carburetor: Any American stock OEM 2 barrel up to 1-11/16" throttle bore with no adapter plate. No modifications of any kind will be allowed to these carburetors except the removal of the choke plate and shaft. Box stock only. The jets may be changed as needed. Conventional round type air cleaners only. No air induction plastic carburetor inserts or other devices to direct air into intake. NO airboxed or difusers.

The Holley carburetor, part #4412 is acceptable and must run a maximum spacer adapter of 1-1/16" including gaskets. Holley modifications allowed: Holes drilled in the throttle plate for proper idling. Drilling, tapping and plugging of the unused vacuum ports. Welding of throttle shaft to linkage arm. Drilling of idle or high speed air correction jets. Milling of center carburetor body metering block surface. A maximum of .015" on each side. Any modification not mentioned is not legal.

M. NON-SPEC: Only North American passenger car V-8 manufactured engines allowed with a maximum displacement of 408 cu. in.

1. Intake manifold must be cast iron 2 barrel or 4 barrel stock passenger car only. NO porting, polishing, welding, matching, or acid etching.

2. Carburetor: 2 barrel and air cleaner same as for spec 358 engine. 4 barrel- Any American stock OEM 4 barrel. Quadrajet on GM, Holley on Ford and Chrysler. No dual pumpers. 1-1/16" maximum spacer plates including gaskets. No modifications of any kind will be allowed to these carburetors except the removal of the choke plate and shaft.

N. NOTE: Trucks may use big blocks must must use the same guidelines as small blocks.

 

 

36. TOW HOOKS: Must be attached to the frame front and rear, extending above the bumpers for easy access. Mandatory tow hooKs in both the front and rear of car.

 

37. TECH INSPECTIONS: After feature, winner and cars selected at random will be inspected. Cars found to be illegal upon first offense will lose its finish position, points, and money for that event. The remainder of the field will be advanced to cover that position. Upon the occurrence of a second infraction, all points earned for the year up to that date will be forfieted as well as the points and money for that event.

 

NOTE: All the preceding rules are subject to change. The official(s) in charge reserve the right to make decisions and judge accordingly, with the interest of safety, without recourse. Anything not covered in these rules is up the discretion of the official(s). All cars are subject to inspection at anytime, and must be free from mechanical defects and be in safe racing condition. OFFICIAL'S DECISION WILL BE FINAL!

 

TIRE NOTE: At the end of the 1999 season, tire manufacturers were asked to quote price to racer for a spec 4 ply tire. Hoosier's price was $92.00 for the RC4 and $96.00 for P-Series, with no points fund and Hoosier only tire. American Racer's price for P-Series tire, allowing Hoosiers to be used up for one year, was $78.00. We realize the escalating cost of racing and feel implementing this tire in as a spec. tire is a step in controlling costs.