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2008
Pro Stock RULES
2008 PRO STOCK 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, falcons, 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. Ford and Mopar bodies and engines will be allowed on GM frames. SAFETY RULES - The following rules are mandatory and will be strictly enforced. 1 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! 2. ROLL CAGE: NO OFFSET CAGES. Must be minimum 1 ½" outside diameter (1/8" wall thickness highly recommended), no soft metals (aluminum, etc.) allowed. The mandatory six-point cage must surround the driver w/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 and one (1) horizontal cross support 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 21-1/2" back of the front body mount and must extend to the front of the top roll cage. Rear main cage uprights must not pass rear trailing arm mounts. Mounts must be in stock OEM locations. 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 w/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. A minimum clearance of 2” is required between the top of the driver’s helmet and the underside of the horizontal roll cage bars. 3. SEATS: 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. FIREWALL: OEM stock or optional sheet metal firewalls. No tipped or angled front firewalls. Must be installed at 90o to frame. 6. 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. Disc brakes will be allowed providing that rotors, calipers, and mounting brackets are all stock OEM parts. (NO ALUMINUM AFTER MARKET 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, wheels must be reinforced, "Steel only". Recommended: Racing wheels and oversized studs. Maximum width 8", bead lock rims permitted. No bleeders. 13. EXHAUST: Stock manifolds or conventional headers only. Exhaust terminations must be behind the driver, exhaust cannot exit through door or body and must not point to the ground. 14. Inspectors reserve the right to request body or sheet metal to be replaced and painted if it has any sharp edges or is not looking presentable to the sport. No sharp edges on bumpers. 15. THROTTLE SPRINGS: Minimum two (2) required. All linkages must be made of tubing, no all thread. Throttle stop highly recommended. BODY SPECIFICATIONS 1. BODY - must be stock appearing in stock location on frame. "NO CHOPPING OR CHANNELING." No flat sheet metal. It will be acceptable to use up to present date stock steel sheet metal bodies, or steel or aluminum after market bodies providing they look stock and match up to the wheel base of the frame being used. Aluminum bodies allowed. Left side door panel MUST be .080 thick (separate interior panel may be installed). No open 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" *Stock manufactured sheet metal or an exact replica required and must maintain the OEM fit*. Full fenders only, with reasonable radius cut for tire clearance allowed. Inner fender panels may be removed if fender remains secure. Steel engine firewall is mandatory with all holes securely covered (sheet metal only). Full rear firewall and rear window shelf must seal off driver compartment from trunk area. 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 2. FLOORBOARDS: OEM stock floorboards or optional sheet metal floorboards. Must have center drive shaft tunnel. Maximum tunnel height will be 12” from left side floor board. 3. ROOFS: Must remain at stock height specifications. No angled or tipped roofs for aerodynamic advantage. Side window openings must be within 1 ½” front to rear. OEM or fiberglass replicas. “NO homemade square roofs”. 4. FENDERS: Cut for clearance is allowed, but, must be straight cut or rolled under. No outward rolls of fenders will be allowed. 5. PICKUP TRUCKS: Must maintain minimum wheel base specifications for stock cars-minimum 105” wheel base. No 4 wheel drives. Extra cab trucks allowed – highly recommended to maintain good 6 point cage configurations. Cabs & beds must be in stock location on chassis. Small block – GM Crate 602, 358 or 408 cubic inch engines only. No big block in S-10 or Ranger trucks. All other stock car rules apply to trucks. CHASSIS SPECIFICATIONS 1. FRAME: 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. "NO FRONT WHEEL DRIVE CHASSIS." Frame may be shortened in the tub area only to accommodate shorter wheel-base bodies (front and rear stubs must remain stock). 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. 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. Frames must be kicked out equally on the right and left sides. *See attached drawing. 2. STEERING: Steering column must remain in stock location right to left, front to back. Steering quickeners are allowed. Quick release is mandatory. 3. 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. No electric fans. 4. 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 center of the number one spark plug hole, on all make engines (furthest cylinder forward) is in line with the center of the top ball joint. NO SLIDING MOTOR MOUNTS. NO CUTTING CROSS MEMBERS FOR FUEL PUMP CLEARANCE. Number 4 cylinder (spark plug) must be in center shock mounting position on GM products. (metric cars) Monte Carlo, Impalas, Grand Prix, No. 1 plug must be in line with center of ball joint on No. 1 cyl. 5. 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. Transmissions must be of conventional design. No small diameter clutches or flywheel. 6. SCATTERSHIELD: Steel scatter shields or steel scatter proof 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 AND BOTTOM TO INSPECT FLYWHEEL AND CONVERTER. 7. DRIVE SHAFT: Steel drive shaft only. Steel drive flanges on rear and transmission only. 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 or orange. Must have 180o strap under rear of shaft. 8. REAR END: Differential housing must be in stock location. Stock type rears only. Passenger car only. No truck or wide rears allowed. No quick changes. Welded spiders or steel spool only. No limited slip allowed. It is recommended that integral type rears with horseshoe clip holding axles in be tack-welded to prevent fall-out. Five (5) lug nuts per wheel mandatory. No aluminum spools. 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. Adjustable tubular upper or lower trailing arms allowed, but must maintain stock lengths. 9. FRONT END: (Except shocks) must be stock type components and location. Minimum of five (5) lug nuts and lugs per wheels, mandatory. Highly recommended: Wheel lugs be 5/8" in diameter and must go past the full thickness of the wheel nut. This must be on all four corners of race car. 10. WHEELBASE AND TREAD: Must maintain stock specifications for chassis running with a minimum wheelbase of 105". No wheel base setbacks. No rear end offsets, this applies to all four corners. Maximum tread width, front and rear 80" maximum ½ " tolerance for all cars. Measured from outside of side walls. 11. SUSPENSION: All parts must remain stock with the following exceptions: front spindles may be interchanged GM to GM, FORD to FORD, CHRYSLER to CHRYSLER. Upper Control Arms only, stock, or tubular aftermarket style permitted providing they are not adjustable type, must be steel only or crossbar steel only. ALL MOUNTING LOCATIONS MUST BE STOCK. Rear arms may be tubular but must remain stock dimensions. 12. 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). 13. SHOCKS: No air shocks, coil over, load-levelers, etc. No air bags. No aluminum or adjustable shocks, steel only, no rebuildable shocks. 14. 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 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. 15. BUMPERS: Front: May be securely reinforced under and at the ends of the splash guard in order to remain stock appearing. No factory hard plastic or fiberglass noses. Aftermarket soft nose permitted. “No MD3 nose pieces.” Rear: Stock OEM-style or soft plastic tail pieces permitted. Optional: tubular rear bumper permitted of round or rectangular tubing must be mounted in direct line of frame rails. Maximum tubing size will be 2” round or 2 x 4 rectangular. Bumper ends must not pass outer edge of body and ends must not have any sharp edges or hook-style ends. Ends must be rounded off. Stock bumpers front and rear must have ends rolled into body metal to eliminate hook ends on bumpers. All bumpers must be securely fastened and neat in appearance. Bumper rules will be strictly enforced and at the discretion of the track official. 16. 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. Recommended fuel cells meet FIA/SPEC/FT-3 or SEI 28.1/2.2. 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. 17. 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 fuel cell and be painted white and carry the car’s number. Use of minimum two ½” grade 5 bolts or greater. Maximum of 75 lb. per weight pack. 18. TIRES: Tires: Passenger car tires or racing tires are permitted. When using passenger car tires only DOT street radials are permitted, with a tread width no wider than 11”. American Racer (McCreary) 84/8-15 DT, 82/8-15 DT, and 86/8-15 DT, Hoosier 27.5/8.0-15 RC4, 26 5/8.0-15 SCL, 27 5/8.0-15 SCL. HARD only. Right and left rear hard mandatory. 19. WEIGHT: Minimum weight will be 2800 for GM Crate No. 602 alternative engine; 3000 for spec. 358 engines; 3200 for non spec. engines. Weight is with driver, at conclusion of heat or feature race. Weight is at Speedway, on Speedway scales, "THE TRACK SCALES ARE OFFICIAL". NOTE: Any car utilizing the 2 barrel option in their respective weight category may receive an additional 100 lb. Weight break, you must declare your carburetor prior to the event to receive your weight break. 20. GM CRATE 602 OPTION, 361 to 408 and SPEC 358 ENGINE RULES: GM CRATE NO. 602 MAYBE USED AND RECEIVE BODY AND WEIGHT CONCESSIONS. No. 602 motor has a part number for each item as sold, any item is subject to inspection. All part numbers and casting numbers must be visible for inspection. SPEC. 358: NON-PORTED STOCK OEM BLOCK AND HEADS ONLY! NO 400 BLOCKS. ENGINES MUST REMAIN STOCK AS MANUFACTURED WITH THE FOLLOWING EXCEPTIONS: A. Only North American passenger car V-8 manufactured engines allowed with a maximum displacement of 358 cu.in. plus 3 cu.in. wear allowance. B. The engine block and all internal parts must meet stock specifications for its make. No Bow-Tie heads or blocks allowed. No Ford SVO or special race parts or Chrysler race parts. Please call for info on these products. C. All engines must maintain stock bore and stroke combinations. Example: Chevy 350 cu.in., 4" bore x 3.480" stroke. Chry. 360 cu.in. 4" bore x 3.578" stroke. Chry 340 cu.in. 4.040" bore x 3.313" stroke. Ford cu.in. 4" bore x 3.5" stroke. ONLY THE FOLLOWING ENGINES AND OVERBORES LISTED BELOW WILL BE ACCEPTED! Chevy – 350 cu.in. up to .060" (max.) Ford – 351 cu.in. up to .060" (max.) Chrysler – 360 cu.in. up to .010" (max.) Chrys. 340 cu.in. up to .060" (max.) D. ALL ENGINE PARTS MUST HAVE CASTING OR PART NUMBERS ON THEM FOR IDENTIFICATION E. CYLINDER HEADS: Special note. 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, Ford performance, and GM Angle Plug heads will not be allowed. WORLD PRODUCT Chevy Part Numbers 4265, 4266, 4267 will be allowed. WORLD PRODUCT Ford Part Number 5303 will be allowed. Chrysler W-2 is 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 (360*) around the valve stem, if the ball drops down towards 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 valve allowed. Note: The only titanium allowed in these engines will be the valve spring retainers. Any Carbon Fiber parts used in these engines will be illegal. Valve stem maximum and minimum diameter must be, Chevy 11/32" Ford 11/32" Chrysler 3/8". Milling or angle milling of the cylinder head to any amount will be allowed. Any amount of valve seats per cylinder head will be allowed to be installed for the purpose of repairing a head. No epoxy or coating of heads allowed. 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. Officials’ decision will be final. F. CRANKSHAFT: Any steel or cast iron allowed providing it maintains stock stroke as manufactured for the engine block used. G. RODS: OEM stock production or aftermarket solid steel are allowed. No titanium or aluminum rods. H. VIBRATION DAMPENERS: No aluminum dampeners.
I. CAMSHAFT: Any make hydraulic or flat tappet allowed. (no roller cams, no mushroom lifters allowed) No lash caps allowed. Shaft rockers are not allowed. Roller rockers allowed. 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. Must maintain stock firing order. J. INTAKE MANIFOLD: No porting, polishing, welding, matching or acid etching. Permitted intake manifolds are: CHEVY: Edelbrock Victor Junior Sportsman 2V, Edelbrock Performer part number 2101 OR 2116, Edelbrock part number 5001. GM part numbers 2901 (Standard head) or 2912 (Vortec head) and 2913. 1” spacer or adaptor may be used, Weiand part number 7547. FORD: Edelbrock part number 2181 or 5021; Ford part numbers 2940 or 2941, Weiand part number 7515; Chrysler 2915 Victor with adaptor or Chrysler stock cast iron, Weiand part number 7545, Edelbrock part number 5076. K. CARBURETOR: Any American stock OEM 2 barrel carburetor up to 1 11/16" throttle bore with no adapter plate is legal on cast iron manifolds. Holley carburetors, part #4412 (2-barrel) and model #4160, part #03310-S, -C, -2, -3, -4, -5, -6, or -7 (4-barrel) are acceptable and may run a maximum spacer adapter of 1 1/16" including gaskets. The 03310 may have a maximum throttle bore of 1 9/16”, and vacuum secondarys only. Only one (1) carburetor, 2-barrel or 4-barrel may be used. 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 air boxes or diffusers. No down leg boosters on 3310 series carbs. CARBURETOR MODIFICATIONS ALLOWED: Holes drilled in the throttle plates for proper idling. Drilling, tapping and plugging of 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 other modification not mentioned is not legal. L. IGNITION: Stock OEM distributors and coils only. (No trigger ignition systems allowed.) On H.E.I. ignition, coils must remain in distributor if stock OEM. On point type distributors, coils must be stock. With any system used, only one coil will be allowed on car. Firing order must remain stock. M. LUBRICATION SYSTEM: No dry sump system allowed. Oil must be in steel pan only. Oil pan must have ¾" inspection hole for connecting rod verification on left side of pan. No external oil pumps allowed. No Accu-sumps allowed. The use of oil coolers will be permitted, providing they are mounted under the hood only. N. WATER PUMP: Radiator fan must be steel only. No electric cooling fans or pumps. O. FUEL PUMP: Must remain in and be driven as stock OEM equipment. No electric pumps or glass bowl filters. NON-SPEC: 361 to 408: A. Only North American passenger car V-8 manufactured engines allowed with a maximum displacement of 408 cu.in. maximum. B. The engine block and all internal parts must meet stock specifications for its make. No bow-tie heads or blocks allowed. C. All engine parts must have casting or part numbers on them for identification. D. CYLINDER HEADS: Special note: 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. Heads must be manufactured by manufacturer of engine block. 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, and Ford performance, Angle Plug heads will not be allowed. WORLD PRODUCT Part Numbers 4265 and 4266 for GM Products, and part number 053020-A or B, for FORD Windsor, will be the ONLY after market heads allowed. MOPAR products are currently under investigation for a suitable substitute. 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 (360*) around the valve stem, if the ball drops down towards 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 valve allowed. Note: The only titanium allowed in these engines will be the valve spring retainers. Any Carbon Fiber parts used in these engines will be illegal. Valve stem maximum and minimum diameter must be, Chevy 11/32" Ford 11/32" Chrysler 3/8". Milling or angle milling of the cylinder head to any amount will be allowed. Any amount of valve seats per cylinder head will be allowed to be installed for the purpose of repairing a head. No epoxy or coating of heads allowed. 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. Official’s decision will be final. E. CRANK SHAFT: Any steel or cast iron allowed providing it maintains stock stroke as mfg. for the engine block used. F. RODS: OEM or stock appearing after-market steel rods are allowed. No titanium or aluminum or light weight rods. G. VIBRATION DAMPENERS: No aluminum dampeners. H. CAMSHAFTS: Any make hydraulic allowed. (No roller cams, no mushroom lifters allowed) No lash caps allowed. Shaft rockers are not allowed. Roller rockers permitted. 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 re-bushed for wear. Cam must maintain stock firing order. I. INTAKE MANIFOLD: NO PORTING, POLISHING, WELDING, MATCH PORING, OR ACID ETCHING. Only 2101 or 2116 aluminum intakes allowed. Stock OEM cast iron intakes or GM 14098499 allowed. Mer-cruiser intake allowed but “NO” adaptor plate or spacer allowed. J. CARBURETOR: 1. 2-Barrel - Any American stock OEM 2-barrel carburetor up to 1 11/16" throttle bore with no adapter plate is legal on cast iron manifolds. The Holley carburetor part #4412 is acceptable and may run a maximum spacer adapter of 1 1/16" including gaskets. 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 airboxes or diffusers. Holley Carburetor 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. 2. 4-Barrel - Any American stock OEM 4-barrel quadrajet or Holley 03310-S on GM vacuum secondary. Holley on Ford and Chrysler part numbers must be visible. 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. Box stock only! Conventional round type air cleaners only. No air induction plastic carburetor inserts or other devices to direct air into intake. No air boxes or diffusers. No dual pumpers. No down leg boosters on 3310 series carbs. K. FUEL: Gasoline ONLY, no nitrous or any other additives. L. IGNITION: Stock OEM distributors and coils only. (No trigger ignition systems allowed.) On H.E.I. ignition, coil must remain in distributor if stock OEM. On point type distributor, coils must be stock. With any system used, only one coil will be allowed on car. Firing order must remain stock. M. LUBRICATION SYSTEM: No dry sump system allowed. Oil must be in steel pan only. Oil pan must have ¾" inspection hole for connecting rod verification on left side of pan. No external oil pumps allowed. No Accu-sumps allowed. The use of oil coolers will be permitted, providing they are mounted under the hood only. N. WATER PUMP: Radiator fan must be steel only. No electric cooling fans or pumps. O. FUEL PUMP: Must remain in and be driven as stock OEM equipment. No electric pumps or glass bowl filters. P. NOTE: TRUCKS MAY USE BIG BLOCKS BUT MUST USE THE SAME GUIDELINES AS SMALL BLOCKS. 21. 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. 22. TECH INSPECTIONS: After feature, winner and other cars selected at random will be checked. Illegal cars upon first offense will be delegated to last place money and last place points; second offense will receive no money and no points. 23. All vehicles must have the capability of starting without being pushed or pulled or will go to the rear. 24. NO RADIOS !! 25. ANYONE FOUND TO BE SPEEDING IN THE PIT AREA WILL BE FINED $25.
26. No traction control of any kind – mechanical or electronic allowed. All wiring from distributor or tachometer must be in plain view for inspection and have no splices or interruption in these wires. Speedway will have the right to confiscate any part of the ignition system for further inspection. If parts are confiscated, prize money and points will be held until results of inspection are known. All legal parts will be returned within 5 days. Violation of any of these rules will result in disqualification. NOTE: The preceding rules and regulations are designed to provide for the orderly conduct of racing events and to establish minimum acceptable standards and requirements for such events. By participating in these events, all participants are deemed to have complied with these rules and regulations. No expressed and/or implied warranty or safety assurance shall result from publication of, or compliance with, the preceding rules and regulations. They are intended as a guide and are in no way a guarantee to any participant, driver or official, against injury or death. Any of the preceding rules maybe subject to revision if it is felt that the change would be in the interest of safety or the Division. Track Officials have the right to make decisions and to rule accordingly, in the interest of safety, without recourse from the drivers and/or owners. Track Officials will decide anything not covered in the preceding rules and regulations if, and when, it becomes necessary. ** Any changes to rules from previous year are underlined **
Transponders will be used for scoring at Tri-City. Once you have your transponder, you will need to provide us with the ID number to enter in our scoring system. Transponders must be mounted on the right rear frame rail a minimum of 12” from the rear axle centerline. The transponder must be mounted vertically with no obstruction between the transponder and the ground. It is recommended that a shield be installed in front of the transponder for protection from clay and debris. If using a rechargeable transponder with a mounting bracket, it is recommended that the transponder be reinforced with tie wraps or the like to prevent dislodging. Do not rely solely on the cotter pin.
No offset cages. If kickout is used on left side it must be kicked out on right side of equal distance and cage mounted centered with chassis from back of midrail section, stock OEM rear frame must be used including front spring brackets and continue out to include upper stock shock mounts. Box tube may be used from behind shock mounts to rear if needed. Stock OEM rear frame rails may have tubing running inside of rails or plated on top for support only if needed. MANDATORY SAFETY RULES
1. All cars are subject to inspection at any time and must be free from mechanical defects and be in safe racing condition. 2. Driver’s seat must be securely fastened to frame or cage 3/8" bolts minimum. It is recommended that seats mounted over drivelines have a minimum 1/8" steel plate under and up the back 4" and be as wide as seat. 3. Flame retardant/shock resistant padding must be installed anywhere the driver may come in contact with driver’s head or any other points of contact. (To include the center of the steering wheel.) 4. All cars must have 4 (four) wheel hydraulic brakes, all in good working order. Steel rotors only. 5. Battery must be properly secured and must have top and terminals completely covered by rubber. 6. Fuel lines, power steering lines, and fittings running through driver’s compartment must be of approved type. (Braided lines recommended.) NO CAST IRON FITTINGS. 7. Exhaust headers must be safe for driver and recommended to exit past driver’s seat. 8. All cars must be equipped with 5-point seatbelts to “SF1 16.1 specifications”. All belts must be securely fastened to frame or cage. The sternum shoulder harness is highly recommended. Belts older than 48 months will not be allowed. Damaged belts will also not be allowed. 9. Tri-City Speedway highly recommends all drivers wear newest Snell approved full-face helmet and clean one piece SFI drivers suit, underwear, head sock, gloves, foot socks, and shoes to SFI specification 3.2A & 3.3, arm restraints and neck brace. 10. No drums of racing fuel may be brought onto the track premises 11. Retention of Vehicles and Parts as per Insurance Requirement: Participant hereby grants Tri-City Speedway full and unconditional permission to collect and retain vehicles, parts of vehicles, equipment, or any other items used in conjunction with participation that are owned by or in the possession of participant or present at an event (collectively “items”), including such items that may be relevant to the investigation of an accident; the inspection or testing of such items, or for any other purpose Tri-City Speedway may exercise this right to take and retain items at any time when Tri-City Speedway determines in its sole and absolute discretion that such actions are necessary. When an item is suspected of being out of compliance with a Tri-City Speedway rule, or when an item has been involved in an incident, Tri-City Speedway may in its sole and absolute discretion collect and retain such items if Tri-City Speedway believes it necessary to do so to further investigate, make a final determination, and/or preserve evidence, all in Tri-City Speedway’s sole and absolute discretion. At any time that Tri-City Speedway collects and retains items, Tri-City Speedway will try to safeguard such items and return such items when Tri-City Speedway has completed its work with them, but Tri-City Speedway makes no representations or warranties that the items will not be lost, damaged, destructively tested, destroyed, or otherwise affected. The rights granted to Tri-City Speedway in this subsection shall also apply to any Tri-City Speedway track officials.
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