2024-2025 THUNDER TRUCK RULES

Full size pickups only. No, El Camino’s, Rancheros, S-10, or small rangers.

Weight: 3300 lbs. minimum weigh

 Body:

1. Truck must be stock. No modifications or alterations of any kind allowed. No skirts permitted – Frame to ground ride height must be 6” (same as frame height). Doors and tailgates must be secured and in place. All doors must be bolted or welded shut. Drivers’ door must be welded shut.
2. Interior parts can be removed with hand tools only. All openings in firewall must be sealed. Driver must be protected at all times.
3. Driver’s door bars must be extended to outer panel to allow for safety space between driver and bars. Passenger door may be gutted for bar clearance only.
4. All exterior moldings, lights, and trim must be removed.
5. Hood may be gutted with no holes. No air boxes allowed.
6. Front inner panels may be removed. Outer fenders may be trimmed for tire, must remain stock appearing – may not “look” altered
7. Must have minimum of 2 bars in front of the driver. Lexan is also acceptable, but no glass. Wire guard
8. Bumpers must be stock from factory and can be reinforced from behind. Tow loops required at both front and rear. Or tubular bumper turned in on the ends with one guard at top to protect radiator 10’’ maximum
9. Side rub rails accepted one per side. Maximum 1-inch square tubing mounted flush to body, painted same as car. No sharp ends. May be welded or bolted with 3/8-inch carriage bolts.
10. All vehicles with enclosed front ends and bumpers are required to have a hook or chain loop device, to allow hooking by a tractor or wrecker, capable of supporting the weight of the vehicle when lifted. This procedure must be capable of being carried out without raising the hood.
11. No spoilers
12. Cannot close in the bed nor the interior of the truck

 Brakes:

1. Stock factory brakes.
2. Factory or Hydraulic clutch allowed in factory pedal location.
3. All 4 brakes must work
4. 1 factory stock master cylinder
5. Drum or disc brakes allowed with adjustable proportioning valves. Must be Tech visible and not accessible to the driver during the race. Must be factory.

 Roll Cage

1. Seat must be mounted to roll cage in stock position. No offsets
2. Full 4 post roll cage with at least three driver’s side door bars required. Two door bars are required on passenger side. Bracing can be placed form roll cage through back window to truck frame.
3. Front radiator loops are allowed. 1 3/4″ O.D loop roll cage okay.

Chassis and Suspension

1. “Ford” can bend right or left front axle for 5 deg camber.
2. “Chevy” can replace upper A-frame mounting bolts with longer bolts for max 5 deg camber. Must be factory length. A-Frame must remain in stock location and remain stock OEM for make/ model of truck
3. Factory springs only. May not be cut. Must be within 2’ height difference from side to side. No spring buckets or spring rubbers allowed
4. Truck must have 6” ride height
5. Rear leaf springs may not be arched and/or de-arched but must have same number of leaves on both sides. Adjustable shackles acceptable. May cut out bed and leaf springs may go through bed to lower trucks.
6. No racing shocks. Factory shocks only. Steel body no rebuildable and nonadjustable. Front shocks must be in stock location. Rear shocks can be relocated. Mounting point are optional . Must be centered within the frame rails
7. No racing springs allowed – None: front or rear
8. Right front upper control arm can be modified to achieve up to 5 deg maximum castor camber. Extended bolts allowed. Ford only, can bend left or right to achieve same 5 deg max

Drive Train

1. Rear end may be locked or opened. Mini spools ok. No lockers or limited slips
2. Stock manufactured manual or automatic transmission must be in working condition. Automatics must use stock converter. 10’’ minimum. No light weight OEM, No power glides
3. Must have all working gears from factory
4. Engine must be in stock location for make and model. Solid Mounts
5. Stock manufactured clutch, pressure plate, and flywheel assembly required – must be stock diameter: 14lbs flywheel, 10″ clutch & pressure plate. No aluminum components allowed. Sold steel hub. Spring disc optional. solid deflection device

Tires and Wheels

1. Spoke or racing wheels allowed.
2. Wheels may be no wider than 8 inches. Off set can be 2’’ , 3’’ and 4’’ back space . No wheel spacers
3. Hoosier H-500 or DOT tires are acceptable
4. Overall width of truck from outside of tires: Tire to tire no to exceed 80” total – both front and rear max width 80”

 Fuel

1. Only track approved fuel allowed. No additives of any kind will be allowed. No E85 or alcohol allowed. E87 (or higher), Sunoco 101 or 110 racing fuel only. Gas pump allowed
2. Fuel cell mandatory and must be in bed of truck with maximum 22 gallons. No electric fuel pumps allowed.
3. Fuel cell must be mounted to the frame. The depth of half of the overall height and must be minimum of 10 inches off the ground with protection bars.
4. No boat tanks or non-approved fuel cells (4-17 SSE tech has final approval on cells)

Engine

1. Stock GM, Ford, and Mopar V-8’s only. 602 Crate motor is also allowed with factory seals can be mixed between models.
2. Camshaft .450-450 Chevrolet 305,327, or 350. No 400’s Chrysler 450 intake 465e,318 or 360 Ford 461 intake 461e, 302, or 351.
3. Intake manifold unmodified stock aluminum (p#7101) only. Block can be bored .040 over +.010. 500 cfm 4412 Holly, 1 inch adapter plate. Carburetor claimer applies. $25.00 and new 4412 unopened box. Must have double return springs
4. Distributor- OEM Electronic only, may be locked
5. Stock or racing oil pans – Must have inspection hole in oil pan for crank/ rod inspection. No dry sumps
6. Radiators- any type that will fit under hood with 1 gallon overflow pan.
7. Static compression ratio maximum 180 pounds compression
8. After market aluminum and/or steel pulley allowed.
9. Poly locks okay.
10. 1.5 roller rockers. For Chevrolet 1.6 roller rockers, for Ford stock roller rockers per manufacturer
11. Any steel head for GM. No bowtie or aluminum headers. Must add 50lbs to total weight if you have headers

 Exhaust

1. Cast iron exhaust manifolds or headers only.
2. Exhaust pipes up to 3″ outside diameter are permitted. Must exit past the driver.

 Miscellaneous

1. Ballast may be added. Must be securely bolted down and covered.
2. Window net and fire extinguisher are mandatory on all Southern Stock V8 Trucks
3. Safety battery shut off switch. Must be visible to safety or within drivers reach inside the cab.
4. No Mirrors are allowed
5. Receivers are required
6. Radios are NOT allowed This is a protest division. Refer to General Rules for Protest fees. PROTEST MUST BE SUBMITTED IN WRITING AND FEES PAID TO TECH WITHIN 10 MINUTES OF RACE COMPLETION (NO EXCEPTION). Must finish on the lead lap. Tech discretion

The track reserves the right to add weight at its discretion for the fairness of competition.

 **If these rules do not say you can do it then do not do it! All interpretations by the Tech man are final. You are responsible to know the tech man’s position on all rules. Refer to the General & safety rules for more informa