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Cumberland Valley 2019 Schedule


3.0 DIESEL 4x4 TRUCK RULES 2018-2020


3.0  Diesel 4X4 Trucks 

1. The OEM chassis is mandatory. The vehicle must retain the full OEM chassis. Wheel tubs, back- half conversions, tube chassis are prohibited. Maximum wheelbase 158” and 102” maximum width.

2. The body must be the OEM truck body, including the full bed floor,or If the bed floor is cut out, the bed must be covered. No flatbeds permitted. The body must retain the full sheet metal, after market hoods permitted. The hood must be closed and securely latched while hooked to the sled.

3. Front hanging weights are allowed, not to exceed 60 inches forward of the centerline of the front axle. This will be measured by center of the front wheels to end of weight assembly. Ballast may be added in the bed of the truck, but securely fastened. Maximum weight 8000 LBS.

4. All drivers must have valid state driver’s license and full SFI firesuit and  helmet. Seatbelt/restraint system must be worn.

5. All trucks must have at least six inch wide u-joint shields around the rear u-joint constructed of at least 5/16 inch steel or 3/8 aluminum that will safely contain the u-joint and the end of the rear driveshaft. All shield must be securely mounted to the vehicle. Any front shaft u-joint that is visible from the side of the truck must be shielded to contain the u-joint and the end of the shaft.

 6.The engine is limited to stock appearing, engine can be interchanged between Dodge, Ford, and GM

  1. As long as they came in a one ton truck or less from the factory. Complete engine must have stock appearance except where otherwise noted in these rules. Front of engine block can be no farther forward than 17” of centerline of front axle. Engine must have cable surrounding engine block and head. The cable is 3/8 diameter located between #1 and #2 cyclinders. Cables must pass through mainfolds. Cable will have 4 to 6 inches of slack. There will be two clamps at splice.
  2. Cylinder head must be OEM or OEM replica for that brand engine. Outside dimensions of cylinder head must measure factory width and length, Head must retain OEM valve angle.
  3.  All vehicles must be equipped to direct exhaust upward. Two-3/8 inch diameter bolts must be place through the exhaust pipe in a cross-pattern within one inch of each other, within 12 inches of the turbo.

  4. A fire extinguisher system is permitted. A 2.5 LB Fire extinguisher must be securely mounted. A complete OEM firewall is mandatory.

  5. The complete OEM floor pan is mandatory.

  6. Hand throttles permitted,forward to rearward operation only with wide open being forward. If using a foot throttle it must be a toe strap on it. Diesel fuel only.  No propane or NO2 permitted or any other oxygen enhancers. Racing fuels cells permitted.

  7. Maximum of one P7100 series pump limited to one plunger per cyclinder. The use of multiple highpressure common rail fuel pumps is legal. Powerstroke engine may uitlize a second HPOP.

  8. Hook point to be no closer than 44” of centerline of rear axle, hitch height maximum of 26”,with a minimum of 3.75X3.0” opening. Hitch point must be easily accessed. No “trick” type hitches permitted. Hitch must be stationary in all directions. Hitch must be frame mounted. Hitch must be centerline of rear axle or behind. Hitch must not exceed a maximum of 25°angle from pivot point to hook point. No hitch supports or adjusters fastened to the rear axle housing shall be above the centerline of the rear axle. Pivot pin of drawbar can be no farther forward than the centerline of the rear axle.

  9. Axle shields are required. Shield to be .060” thickness steel or aluminum. Shield not be mount to axle ends or hub bolts. A hole may be cut in one to allow locking in of hubs.

  10. Safety switch (rain cap or guillotine type) must shut-off air to engine to a complete shutdown. Safety Switch will be securely mounted to the back of the vehicle. Ring at rear of truck, minimum of two inch diameter solid ring, which the zip tie will tie to rigid point on truck. For any cases of re-pull, zip tie must be broken.

  11. Hydraulic steering permitted.

  12. Suspension- The upper mounting point for strut assemblies must be in the factory location. Adjustable caster/camber pillow ball mounts are permitted. The lower control arm may be strengthened provided factory mounting points to chassis are maintained. The lower mounting point for the strut assembly may be modified for improved caster or camber. Strut tower braces, lower tie bars, and limit straps permitted. Traction bars and devices permitted. Lowering or raising the vehicle height with suspension modifications permitted; must be bolt on only, welds permitted for attachment to frame or axle housing. Sway bars, limit straps and camber kits permitted. Traction bars and devices permitted. Blocked suspension permitted. No air bags.

  13. Must be DOT approved tire. Maximum height 35 inches. No studded tires or chains. No alterations to tires permitted. No bar or terra tires. No front duals on front axle.

    1. Drivetrain will consist of the following: Any front axle, transmission, transfer case, rear axle permitted. No planetaries permitted.

    2. SFI bell housing and/or SFI blowproof bell housing required.

    3. The turbocharger inlet must be a smooth bore, maximum inlet size of 3.0 inches, (no map rings allowed) All air entering through the 3.0” intake opening, no open or plugged holes allowed anywhere around the intake side of the compressor housing . Intake wheel must protrude 1/8th inch inside of opening.

    4. Water injecton is prohibited. All components must be removed from the truck.

    5. Intercoolers are allowed. Dumping/draining intercoolers without a catch pan withing 100 feet of track is prohibited.