Ballast

1. FWD maximum weight 7500
2. Front hanging weights are allowed, not to exceed 60 inches forward from the centerline of the front axle. All weights must be securely fastened.
3. No adding fuel, water, or ice after crossing the scale.
4. No weight allowed in the cab.

Batteries

1. Must be securely mounted.
2. Cannot be located in the driver compartment.
3. Manual battery disconnect, easily accessible and clearly marked, is required.

Dress Code

1. Driver must wear a helmet meeting Snell 85, 90, 95, 2000, K98, or SFI Spec 31.1.
2. Fire suits are required at a minimum of SFI 3.2. In flip-top bodied vehicles without a firewall or working doors, the driver will be required to wear an SFI 3.2A-5 approved suit.

Driver Restraint System

1. The OEM restraint system is mandatory and must be worn. A five-point safety harness is highly recommended in this class.

Body

1. Each vehicle in competition must be equipped with an OEM floor pan or a minimum 0.024-inch steel floor pan that extends the full length and width of the driver seating area.
2. OEM floor pans must have cross members (minimum two-inch by two-inch, 0.083-inch wall thickness square tubing) installed between the frame rails for proper seat and driver restraint system installation and support.
3. All openings must be sealed with metal—excluding grommets.
4. The use of fiberglass and/or magnesium is prohibited.
5. The vehicle must be equipped with one seat for the driver; it must be properly installed.
6. Each vehicle must be equipped with an OEM or minimum 0.024-inch steel firewall, OR ¼” Lexan from side to side of the body and from the top of the engine compartment’s upper seal (hood, cowl, or deck) to the bottom of the floor and/or belly pan.
7. The firewall must provide a bulkhead between the engine and/or fuel tank and the driver compartment.
8. All openings must be sealed with metal—excluding grommets.
9. The use of magnesium is prohibited.

Exhaust

1. The exhaust may exit downward at the back of the truck, directly out the back of the truck, or straight up through the hood of the truck, or straight up at the back of the cab.
2. All diesel engines must be equipped to direct exhaust upward. Exhaust through the hood is permitted. Four (4) 3/8 (Grade 5) bolts in the horizontal portion of exhaust pipe(s) as close to the turbo as possible. Bolts must be installed 90 degrees to each other, within one inch of each other.
3. Exhaust wheel cage made from stainless steel, bolted or fastened to the exhaust housing as intended by the manufacturer. If the exhaust wheel cage is bolted, a minimum of 8 – 5/16 bolts are required to fasten as designed by the turbo manufacturer.

Driveline

1. Aftermarket transfer cases are permitted. Axle shields are required and must be 0.060” thickness in steel or aluminum.
2. The shield shall not be mounted to axle ends or hub bolts. An access hole may be left open to allow locking in the hubs.

Wheelbase

1. The minimum allowed wheelbase is 90 inches; the maximum allowed is 180 inches. The maximum wheelbase variation from left to right is one inch; the measurement will be made using an X pattern (LF-RR and RF-LR).
2. The maximum tread width is 102 inches. Rear wheels beyond the OEM position are permitted.

Fuel

1. Nitrous oxide is permitted for use on any naturally aspirated gasoline engine.
2. Nitrous oxide may not be used with alcohol or with any supercharged engines.
3. Propane, etc., is prohibited on any engine.
4. System components used for these banned substances must be fully removed from the truck. Other oxygen extenders, such as propylene oxide additives, are prohibited. Racing fuel is permitted.
5. Fuel checks may be taken at any time by the officials.
6. All diesel-powered competition vehicles will have a sampling valve on the return line from the fuel injection pump. The sampling valve needs to have a flexible hose. Diesel must be running when the fuel sample is obtained.

Fire Extinguisher

1. All vehicles must have a 2 1/2 lb. dry chemical or 1 lb. halo extinguisher.
2. The fire extinguisher must be securely mounted within reach of the driver.

Engine

1. All engines must be behind the grill. For gasoline or alcohol engines, the rear of the engine block can be no further forward than the centerline of the front axle. For diesel engines, the front of the engine block can be no further forward than 25” of the centerline of the front axle.
2. Gasoline or alcohol engines may utilize a single supercharger or a single turbocharger. All shields and restraints on the supercharger must be in place.
3. Maximum supercharger size: 14-71, 19-inch rotor length. For vehicles utilizing an 8-71 blower, the following dimensions apply: 16-inch rotor case length.
4. Screw-type superchargers are not permitted.
5. Variable multi-speed supercharger devices are prohibited.
6. Pro-Chargers are allowed a maximum size of F-3R-130.
7. Fuel injection is permitted. A single turbocharger is also permitted in this configuration.
8. Supercharged or single-stage turbocharged engines are limited to 575 cubic inches.
9. All supercharger/procharger drive components must be shielded on top and sides with 0.060” steel or 1/8” aluminum. The side is defined as the centerline of the bottom pulley. The shield should be wider than the drive components.
10. All vehicles using an automotive-type supercharger will use aluminum blower studs, SEMA spec 6061 T-6 to secure the blower to the intake manifold. Blower straps meeting SFI spec 14.1 are required.
11. All turbocharged alcohol engines must shield spark plugs with a minimum of 1/8” steel or aluminum within two (2) inches in any direction from the centerline of the spark plug.
12. Titanium turbocharger components are prohibited.

Diesel Engines

1. Diesel engines are restricted to 6-cylinder and 8-cylinder compression ignition engines. The class maximum of 460 cubic inches will be enforced.
2. Diesel engines must have been available in a one-ton or less truck from the factory.
3. Sigma fuel pumps are permitted. Water injection is permitted.
4. The fuel must be pump #1/#2 diesel only. Soy or biodiesel fuel is permitted.
5. Diesel engines may use an unlimited size turbocharger(s).
6. International DT466 blocks or their replacements will be limited to 2 turbochargers and 2 pressure stages. Maximum of 460 cubic inches.
7. All turbocharged engines will have one cable totally surrounding the engine block and head between the first and second cylinders.
8. The cable will be 3/8 inch diameter and will be between the first and second cylinders.
9. The cable must pass through the exhaust manifold port area.
10. The cable must have a minimum of two clamps at all splices.
11. The cable will have 4” to 6” inches of slack.

Throttle

1. Either the normal foot throttle or an approved spring-loaded hand throttle will be permitted in this class.

Safety Equipment

1. All trucks must have at least a six-inch-wide U-joint shield around the rear U-joint constructed of at least 5/16-inch steel or 3/8-inch aluminum that will safely contain the U-joint and the end of the driveshaft. All shields must be securely mounted to the vehicle.
2. Any front shaft U-joints that can be visibly seen from the side of the truck must be shielded to contain the U-joint and the end of the driveshaft.
3. Axle shields are required. The shield must be 0.060” thickness steel or aluminum. A hole may be cut in one shield to allow operation of the hub lock.
4. A safety switch (rain cap or guillotine) must shut off air to diesel engines. The switch will be securely mounted to the back of the vehicle. A 2-inch or bigger solid ring must be attached to the end of the switch. The ring must be zip-tied to the switch bracket. The switch must also be able to be activated in the cab while the driver is secured in the vehicle.
5. All vehicles equipped with a manual transmission must have a flywheel shield labeled as meeting minimum SFI Spec 6.3 or greater. Applications for which an SFI Spec flywheel shield is not available may use a properly attached SFI 4.1 or 4.2 blanket that completely covers the bell housing. It must be attached to the block and extend rearward to the transmission with a minimum six-inch overlap where it is fastened.
6. A Kevlar-lined containment device (bag or blanket) that completely encloses the intake compressor housing. The bag or blanket used must be commercially available from a USA supplier.

Transmission (Manual)

1. Aftermarket transmissions and transfer cases are permitted. A clutch meeting minimum SFI Spec 1.1 or 1.2 is mandatory on all vehicles that are collecting points. All transmissions must be clutch-assisted. Sequential shifters are prohibited.
2. Aftermarket automatic transmissions are permitted. Aftermarket torque converters, valve bodies, and internal components are permitted.
3. Transmission brakes are prohibited.
4. Any non-OEM floor-mounted automatic transmission shifter must be equipped with a spring-loaded positive reverse lockout device to prevent the shifter from accidentally being put into reverse gear.
5. A functional neutral safety switch is mandatory.
6. A blanket-type shield, appropriately labeled as meeting SFI Spec 4.1 and extending from the rear of the block to the front of the tail housing with a minimum six-inch overlap where it is fastened.

Competition Variances

1. Four-Wheel-Drive Trucks
   a) Maximum weight of all 4x4 vehicles will be 7,500 lbs.
   b) Limited Pro Diesel (3.0) trucks will be allowed to compete in the RWYB class at a maximum weight of 8,000 lbs. if they comply with all current rules in place for their respective class. If the turbo, tires, etc., are changed from current 3.0 rules, the maximum weight is limited to 7,500 lbs. as all other 4x4 trucks. 3.0 trucks will only be allowed to compete in one class per event if both RWYB and 3.0 classes are offered.
   c) Maximum drawbar height for all 4x4 trucks will be 26”, with the following exceptions:
   i. Naturally aspirated trucks will be 28" hitch.
   ii. Naturally aspirated with nitrous will be 27”.

Drawbars

1. Diesel Super Stock Trucks, Lim Pro 3.0 Trucks, Nitrous Engine Trucks (134”-158” wheelbase)
   a) Hook point must be no closer than 44” of the centerline of the rear axle, hitch height maximum of 26”, with a minimum of a 3.75” X 3.0” opening.
   b) Hitch point must be easily accessed. No “trick” type hitches permitted.
   c) Hitch must be stationary in all directions.
   d) Hitch must be frame-mounted.
   e) Hitch must be mounted at the centerline of the rear axle or behind.
   f) Hitch must not exceed a maximum of 33° angle from pivot point to hook point.
   g) No hitch supports or adjusters fastened to the rear axle housing shall be above the centerline of the rear axle.
   h) Pivot pin of the drawbar can be no further forward than the centerline of the rear axle.
   
2. Naturally Aspirated or Blown Alcohol Engine Trucks with 133” Wheelbase or smaller
   a) Hook point must be no closer than 30% of the actual wheelbase of the truck (133” wheelbase is 39.9” hitch length).
   b) Hitch height maximum of 26” (with above exceptions), with a minimum of a 3.75” X 3.0” opening.
   c) No “trick” type hitches permitted.
   d) Hitch must be stationary in all directions.
   e) Hitch must be frame-mounted.
   f) Hitch must be mounted at the centerline of the rear axle or behind.
   g) Hitch must not exceed a maximum of 33° angle from pivot point to hook point.
   h) No hitch supports or adjusters fastened to the rear axle housing shall be above the centerline of the rear axle.
   i) Pivot pin of the drawbar can be no further forward than the centerline of the rear axle.