4x4 Limited Pro-Stock Truck 6050# Classes

This class is designed to be more of an entry level class. This class is not designed to put a 23° engine in a Pro-Stock truck and pull. This class is designed for stock drivetrain/stock valve angle trucks.

 

1. Truck chassis must be a production frame/chassis offered on a production pickup truck limited to that of a ½, ¾ or 1-ton truck. Modifications are permitted to the stock frame but must be all present. Custom or homemade chassis are prohibited.

2. Wheelbase can be no longer than 133”. If a truck is over 133” wheel base, the weight must be no further forward than 193” from the center of the rear axle. This is for “Camper Special” trucks already built. No new builds may use this rule.

3. Truck must be able to drive onto the track and back to the sled, and drive off the track under its own power. Truck may be towed from track if breakage occurs. If truck loses reverse, it may be pushed back to the sled for one event only, but engine must be running.

4. Truck body must be stock appearing. Must have both working doors, front fenders in place, grille, hood, headlights, and/or covers, glass (Lexan permitted), and a factory style truck bed. No flatbeds. No tilt bodies. Hoods must be in place. 0penings are limited to open air cleaner elements, cowl induction scoops and exhaust headers. Fiberglass hoods are permitted. No other fiberglass body parts.

5. Some, or the entire truck bed floor may be cut out, but must be covered if more than 25% of the bed floor is removed. Covering of the tailgate section of the truck is optional.

6. D.O.T. uncut street legal tires only. Maximum size: 33x12.50. No rim size rule. 15” 16” and 17” etc. are all allowed. The rear tires must cover 50% of the front tires. (50/50 rule).

7. Weight racks must be constructed in such a way so that no part of the rack or the weights may extend any further than 60 inches from the centerline of the front axle forward, (weights must be secure). Any weight that falls from the truck under the green flag will be cause for disqualification.

8. Trucks with weights at or behind the front bumper will weigh up to 6300#. Trucks with forward weight bars will weigh up to 6050#.

9. Inner fenders must remain in place or engine side shield installed.

10. A secure seatbelt system is required. Bump stops at the rear of the truck are strongly recommended.

11. Maximum hitch height of 26” to the top edge of hitching device. Hitch must be solid in all directions and may not move in any direction while pulling. Hitch must be at least the distance equal to 34% of the wheelbase from the centerline of the rear axle. No part of the hitch or drawbar may extend farther forward than the centerline of the rear axle. No part of the hitch chassis or otherwise, may interfere with the chain. Hitch must have at least 3.5” round hole. Hitch must be at least 1” thick material, but no more than 1.5” thick. Hitch stem must be braced solid with cross- member attached to the frame above the stem, which will prevent upward movement of the hitch. Point of contact to the stem may be no more than 10” from the back edge of the hitching device (contact may be closer, but no more than 10”). L-shaped hitches are not permitted. No trick hitches or cam hitches will be permitted.

12. Rear suspension may be removed. Rear end may be welded or bolted in solid.

13. Truck must have at least two working brakes.

14. Ladder bars or traction bars are allowed.

15. Rear/Front Axles and transfer cases must be automotive type and in the manufacturer’s factory stock location for the truck. Nothing rated above 1-ton allowed. No aftermarket Pro Fab transfer cases and/or gear boxes allowed. Rockwell or H110 General Motors differential housing/axles are not permitted. Dana 44/60 fronts and Corporate 14 bolt/AAM/Dana 70/80 rear ends permitted.

16. No aftermarket transmissions/housings allowed (example Pro-fab).

17. All trucks must use drive shaft loops and u-joint shields. Must have at least two loops per shaft.

18. Any production single automotive engine may be used with a limitation of eight cylinder and 485 cubic inches maximum.

19. Engine block must be cast iron (factory or aftermarket).

20. Conventional style cylinder heads (ex. 23°) can be cast iron or aluminum. Factory valve angles only. (Dart Pro 1, Ford cj style and a460, Brodix BB2-Plus, 990/188 GM, L88 GM, Pro-Comp 3021, etc. allowed). No exotic or hemi style heads. Ask before you buy. The spirit of this rule is designed to restrict 9°, 11°, 12°, 18°, 20°, SR20, Big Brodie, Pro-filer, DRCE, Big Chief and other types of altered valve angle/exotic heads. No spreadport heads.

21. No hand built or sheet metal intakes. (part number style intakes only, examples: Dart, Holley, Brodix, Edelbrock etc.)

22. Single carburetor only or stock factory fuel injection (LS). No aftermarket fuel injection allowed. No turbos, blowers or power adders. See rule #38.

23. Gasoline/Racing gasoline fuels only. No alcohol, nitro-methane, nitrous oxide or power adders allowed.

24. Engine must remain in stock location. No exceptions.

25. Open headers are allowed, may exit straight up, or down and back. Exhaust must not aim in any other direction.

26. Engine driven fans must be shielded with a minimum of 1/16 inch steel or 1/8 inch aluminum. Electric fans suggested.

27. Harmonic balancers must either be SFI approved.

28. Engine kill switches must be used and must be located above drawbar or to one side or the other so as not to get in the way of drawbar or chain. Kill switch must disable vehicle ignition and electric fuel pump(s).

29. Truck must be equipped with a neutral/park start switch, to prevent a truck from being started in gear.

30. Automatic transmissions are required to use an SFI approved scatter blanket or shield. If blanket doesn’t cover area around flex plate, a flex plate shield must be used. SFI approved flexplate is required.

31. Dual disc slipper clutches only. NO TRIPLE DISC CLUTCHES.

32. Manual transmissions are required to have an SFI approved bell housing with 3/16” thick block plate, or an SFI approved scatter blanket in conjunction with a 3/16” block plate. (Blanket must cover area where bell housing meets block). Flywheel must be SFI approved or meet the following criteria: Steel plate or steel billet. flywheel must have a tensile strength of 60,000 psi & a yield strength of 40,000 psi. Magnesium or aluminum flywheels must meet or exceed former SEMA standards 1-1. No cast iron flywheels allowed.

33. Fuel cells may be used and may be placed on front end. (Nothing may extend farther than 60” form the centerline of front axle
    forward). Fuel tanks cannot be placed under the hood or inside the cab.

34. 5800 and 6300 lb. weight classes. Zero tolerance for overweight.

35. Dry Sump engine oil systems NOT ALLOWED. Wet sump only.

36. Evacuation pump systems allowed.

37. LS Style engines will be permitted on a trial basis for the 2019 year. Turbo chargers will be allowed on LS engines. Engines must be a 5.3 or 6.0 liter within .060 of stock bore and stock stroke. This allowance is for “junkyard/budget engine builds”.