Sprint Car Rules 2024  *No changes for 2024 Printable Version PDF

The rules and/or regulations set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. These rules shall govern the condition of all events, and by participating in these events, all participants are deemed to have complied with these rules. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM PUBLICATION OF OR COMPLIANCE WITH THESE RULES AND/OR REGULATIONS. They are intended as a guide for the conduct of the sport and are in no way a guarantee against injury or death to a participant, spectator, or official.

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 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 the officials. Their decision is final.

To request a car number, please email mail@shebcofair.com

The rules put in place for this division are intended to provide competitors with an opportunity to race a sprint car that is very competitive and yet remain economical. The traditional sprint car chassis (1.5 dia. x .095 wall min.), front axle, steering gear, rear-end and body.

For power, use a stock Chevy 350 cu. in. or Ford 351 cu. in. cast iron block (360 cu. in. maximum), 12 to 1 compression (max) pistons, no roller cam, solid lifter, wet sump oil pump, and specific high horsepower cast iron heads with no modifications from stock. Use steel or aluminum wheels with specific brand and compound of tire.

The car must not weigh less than 1575 pounds (with driver). Standard sprint car top wing, nose wing, brake system, etc. Proper driving apparel is required."

The above is part of the PDTR sprint car rules and is only an overview. Exact rules are detailed in the PDTR rules as published. *******BECAUSE OF NEW TECHNOLOGY, SOME THINGS MAY NOT BE COVERED BY THESE RULES. BEFORE PURCHASING ANYTHING THAT FALLS INTO THIS CATEGORY, PLEASE CHECK WITH US FIRST********

CAR AND DRIVER SPECIFICATIONS ENGINE

1. BLOCK

   1. Any 350 c.i. stock iron block that was available in a passenger car or truck.
   2. Any 351 w c.i. stock iron block that was available in a passenger car or truck.
   3. High performance cast iron blocks including but not limited to those manufactured by G.M., Ford, Mopar or Dart will be permitted. If these high performance blocks are used no weight reduction machining on the block is allowed.
   4. Maximum cubic inch not to exceed 360.
   5. GM 604 crate engine may be used, but must follow and maintain all Wisconsin WingLESS series rules.

   
   
2. CRANKSHAFT

   1. 350 c.i. O.E.M. or O.E.M. replacement (Stock specifications) 3.48" stroke - iron or steel for GM engines.
   2. 351 w c.i. replacement (stock stroke specifications) - iron or steel for Ford engines.
   3. No knife edge.
   4. No weight reduction except as required for proper balancing.
   5. No offset grinding for stroke alteration.
   6. No light weight cranks
   7. No undercut counter weights (except rear counter weight can be cut to fit coupler)
   8. No drilled centers on main bearing journals.
   9. No billet steel
      
      
   Inspection window in pan
   A. Required
   B. Either a 1-inch pipe thread fitting os a #10 fitting.
   C. Plug must be in line with a crankcase journal and can not be obstructed by a windage tray. The plug must be accessible with the engine in the car. (We recommend that the inspection window be located on the left side, centered with the number 2 connecting rod.)
3. RODS

   1. Any steel 5.7" or 6" long for GM products.
   2. Any steel 5.956 long for Ford products.
   3. Any steel, stock length, Mopar Rods
   4. No titanium/No aluminum.
   5. No titanium bolts or nuts.
      
      
4. PISTONS

   1. Any 12 to 1 compression max for all makes. A .3 tolerance is allowed.
   2. No titanium.
      
      
5. CAMSHAFT

   1. Solid lifter only.
   2. .555 max lift at valves.
   3. Only lifters of engine make can be used.
   4. No roller cams.
   5. Steel push rods only.
   6. Roller rockers are acceptable.
   7. Timing chain, belt or gear driven permitted.
   8. Titanium valve spring retainers are permitted.
      
      
6. CYLINDER HEADS

   1. World Products Sportsman II angle plug and World Products 351 w cylinder head, Mopar part# P5249769 only.
   2. 64 cc, 2.02/1.60 valves No. 1115 (Chevy) and No. 5304 (Ford). (Clarified 5-01-09) ***Valve must have continuous diameter from the top of the valve through the bottom of the guide. A minimum of .310 to a maximum of .346.
   3. No porting or polishing.
   4. Stock as manufactured
   5. No combustion chamber modification.
   6. No angle milling. Standard cylinder head reconditioning procedures are ok, including head surfacing to correct warping, valve guide reconditioning and valve seat reconditioning. All repair work done on valve seats must not extend more than 1/4" away from the valve seat.
      
      
7. INTAKE

   1. 2-3/16" diameter - 8 port fuel injection, i.e. Hilborn, Crower, Kinsler.
   2. Large diameter injectors are acceptable when used in conjunction with 2-3/16" diameter reducers.
   3. No relief hole may be drilled above the butterfly on any injector. No alteration of injector manifold mounting holes will be allowed.
   4. No down nozzle injector.
   5. No timed fuel injectors will be allowed.
   6. Electronic fuel injection shall not be allowed.
   7. Only one injector nozzle and one injector line per cylinder and must be in the injector casing. Injection unit shall have one shaft operated butterfly per cylinder. The immediate area of the butterfly must be round.
   8. No slide or barrel type injectors will be allowed.
   9. Applies to all manufacturers (Ford, GM and Mopar).
      
      
8. EXHAUST

   1. HEADER TUBE 1 3/4" outside diameter maximum.
   2. Muffler mandatory. Schoenfeld 112535 or 112530 recommended.
   3. All cars must comply with track's decibel rule.
   4. The following exhaust headers are required: 1054L, 1014L, 1024L or DynaTech, Ford or Mopar equivalent to these numbers.
   5. One collector per side.
   6. No merge collector.
   7. No TRY Y header
   8. No step header
   9. No slip on collectors
   10. No modification to header except to make room for mufflers.
   11. At Tech Inspectors discretion, muffler or collector may be cut off to look for modifications.
   12. No heat coating.
       
       
9. IGNITION

   1. Vertex original style magneto only.
   2. No external coils will be allowed.
   3. No electronic traction control devices.
      
      
10. GENERAL

    1. Wet sump only, pump must be in pan
    2. Fuel - Methanol only. No additive. Upper lube additive only. No gas.
    3. No titanium parts other than valve spring retainers
    4. No flammable liquids or anti-freeze allowed in cooling systems.
    5. All engines must be sealed before racing.
    6. All engines must be inspected before pay will be issued.

    
    

Car Construction Guide - Chassis Specifications

Cars must resemble traditional sprint car design. Anything different (including chassis, body panels, bumpers, nerfs, etc.) must meet pre-approval from PDTR Officials
prior to competition. Any car deemed unsafe by PDTR Officials will be denied competition at any time, including attempting to re-enter the track from the work area.

Miscellaneous