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4300 lb Light Pro Stock Trucks

4300 Light Pro-Stock Trucks


1. Factory sheet metal may run fiberglass hood.

2. Firewall to remain in factory location: driver seat, steering wheel and driver must remain on left side.

3. Full length factory compact truck frame rails only; can reinforce from front to back; cannot add to rear of frame length.

4. Must be compact style truck; S10, Ford Ranger, D50, Jeep Comanche, etc., no full size. Any kind of motor to any kind of body.

5. Wheelbase must not exceed 109 1/4” from center of rear axle to center of front axle.

6. Front windshield mandatory, (can use glass or Lexan); all other glass optional.

7. Beds must be covered if cut out; tailgate are optional.

8. Trucks may not be any longer than 153” max. That’s from center of rear end to the farthest point forward including weights.

9. Weight may be mounted on sled stops. No moveable weights while truck is in motion, this includes the driver.

10. Overall length 52 inches from center of rear axle to the farthest most point including sled stops.

11. One-ton rear ends max.

12. One ton 4, 5, or 6 speeds must have all working gears; OEM transmission max. No cut gears can run automatic and stall converter.

13. Rear tire size-max 33x12.50 DOT approved on 10” wheels max. No truing of tires.

14. Double disk clutch maximum. No centripetal clutches. No  glide type clutches. Pedal style clutches only.

15. Sled stops on the truck are NOT part of the frame.


16. 406 cubic inch small block max (the 351 Cleveland will not be allowed in this class), any aftermarket cast iron block. 2 or 4 barrel Intakes, cast iron or aluminum, may run after market, intake may not exceed 7” tall that is from the base of the carburetor to the top of the engine. (China wall)

17. Any cam and any lifter allowed. Cam and cam bearing must stay in original location kind, no scent additives.

18. Heads cast iron only; may port and polish, may run after market, no 18 degree or lower heads allowed, no aluminum heads. No tolerance on head measurements. Max of 2 valves per cylinder.

19. Factory style distributor; in factory location. Aftermarket distributors are allowed, but it must be in factory position. NO MAGS.

20. Up to one 4 barrel, naturally aspirated carburetor, 850 CFM maximum with factory number on choke housing. Choke housing must remain stock. Numbers may not be altered. All air must go thru Ventura. Carburetor “No Go Tool” must not exceed below factory casting ring in non-modified ventura. Tool must not enter bottom base plate. All other alterations are acceptable.

21. Exhaust headers may go up or back and down, no turnouts.

22. Can run Rev. Limiter cannot use ignition box that can alter timing when in motion.

Engine & Fuel

23. Must run Spec fuel only Sunoco-Purple 110; Blue 112, Orange 114, Red 116, V.P. C-12, C-14, C-16, Torco 112, 114, 116. No alcohol, no nitro propane, no pro oxide, no pro blend, no oxygen carries of any  Sunoco-Purple 110; Blue 112, testing.

24. All trucks must have a fuel dump valve for random fuel testing.

25. There will be a 1% tolerance on all engine measurements.

26. NO traction or timing control of any kind allowed.


27. Stationary in all directions; center of axle to point of hook 39 ¼ inch min.

28. Height is 27” to point of hook to ground max.

29. Hole will be no less than 3” in diameter: 1” min from edge of hole, 3” wide, 3 ¾” deep.

30. No “L” shaped hitches.

31. Hitch may not exceed past front of bed, anchor pin not to be less than 7/8” diameter.

32. No part of hitch to exceed 36” tall. Top stop not part of hitch.

33. No part of hitch adjusters are allowed past hitch point.


34. Steel flywheel and safety bell housing and block plate. ¼” shield 360 degrees: around the engine balancer; not less than 2” wide, except SFI approved balancer. Any SFI approved flywheel is allowed.

35. Engine cooling fans shielded 360 degrees; electric fans may not be covered.

36. Block shields must run the full length of engine and from top of frame to 1” above spark plugs.

37. All drive shaft loops must be within 18 inches of u-joint. Minimum dimensions on loop material are: .125 for steel, .250 for aluminum and 1” wide. No chains or cable to be used for loops. U-joints must be covered on top and both sides.

38. No fuel tanks or fuel lines in driver’s compartment, or batteries, batteries mounted in bed or engine compartment.

39. Must have neutral start switch with light mounted in rear and in cab to show in neutral.

40. Must have kill switch mounted in rear of truck, to kill ignition and electric fuel pump.

41. Must have working fire extinguisher.

42. Weight on class is 4300 lb.

43. All vehicles must have a complete body (including grill and headlight sockets) with the exception of tailgates, mirrors, front and back bumpers.



Melanie Wiley,
Dec 3, 2017, 11:07 AM