Enduro

No mirrors, No radios or communication equipment allowed at any time.
Body
1. OEM stock bodies must maintain stock, appearance, fenders and quarter panels may be cut for tire clearance.
All glass and flammable materials must be removed. Doors must be welded shut.
2. No fiberglass, aluminum, or homemade plastic body parts.
3. Must have front and rear firewall. All holes must be covered.
4. Must have complete floorboard.
5. Boxed interior permitted. Must have inspection cover.
6. Trunk floor and fender wells must remain in car.
7. Trunk floor may be cut for fuel cell. Maximum clearance 3'' around cell.
8. May remove inner front fender wells.
9. Stock bumper only. No push bars.
10. Spoiler height 8'' total material. No spoiler braces.
11. Side skirts around bottom of body permitted.

Fame and Rails
1. Frame and rails must be stock. Any frame bracing permitted. Body must match frame.
2. Minimum wheel base 105'' (1’’ tolerance ) wheel base must match factory specs for body used.

Front Suspension and Steering
1. Any upper control arm permitted.
2. Unaltered lower control arm for make and model required. Aftermarket bushings permitted.
3. Must run OEM spindles.
4. Must run 5'' diameter springs in factory location.
5. Weight jacks permitted.
6. OEM steering boxes only. Must match frame. No rack and pinion of any kind allowed.
7. OEM center link and inner tie rod end required.
8. Outer tie rod ends may be rod ends with tie rod sleeves.
9. Any shock permitted. One shock per wheel. No coil overs.

Rear Suspension
1. 9" Ford allowed.
2. Must mount in stock location only.
3. Rear end must be locked.

Wheels
1. Steel wheels only 10" maximum width.
2. Factory lug pattern only.
3. No bead locks.
4. No wide five wheels.

Brakes
1. Four wheel disc brakes permitted.
2. Single go cylinder only.
3. Proportioning valves permitted.
4. Single piston steel calipers only.

Exhaust
1. Collector header type headers only.
2. Must exit under car.

Transmission
1. OEM standard production 3 or 4 speed transmission.
2. OEM automatic transmission must have OEM type torque converter (10" minimum) in working order.
3. Must have at least one forward and one reverse gear in working order.

Engine Setback
1. Most forward spark plug must be in line with, or in front of ball joint.
2. Must have original engine cross member in original position.
3. Drive line must be in centerline of car.

Engine
1. OEM cast iron V-8 block only.
2. Maximum cylinder bore 4.060.
3. OEM main caps only.
4. May surface deck of block.
5. Piston can extend past deck of the block .010.
6. Engine must match body.
Crank
1. Standard production OEM cast or steel crank only. Eagle crank
allowed 48lbs minimum.
2. Must be standard production stroke for engine.
Chevrolet- 3.48
Ford- 3.50
Chrysler-3.58
3. No knife edge crank.
4. No turning down counter weights or drilling crank pins.
5. May balance engine.

Rods
1. Stock appearing I-Beam OEM design steel rods only, 5.7" maximum length with 3/8" bolts, only.

Pistons
1. Flat top 4 valve relief pistons only.

Cam
1.Hydraulic cam only. .425 maximum lift at valve.

Lifters
1. Hydraulic lifters only.
2. No roller or mushroom lifters.
3. Lifter must be OEM diameter for engine. Chevrolet .842, Ford.875, Chrysler .901.

Timing Chain
1. Any chain and gears. No gear or belt drives.

Heads
1. OEM standard production cast iron heads only. Must have casting numbers.
2. No angle plug heads except Ford or Chrysler.
3. World products S/R (street replacement) heads casting #1-052 permitted.
4. No bow tie, W2 or Ford SVO heads allowed.
5. May surface heads no cc limit.
6. Steel or stainless steel valves only.
7. Maximum size for Chevrolet intake 1.94, exhaust 1.50.
8. Valve sizes for Ford and Chrysler must remain stock sizes.
9. Steel retainers only.
10. Guide plates and screw in studs permitted.
11. Stamp steel stock rocker arms only. No roller tip or roller rockers.
12. No after-market shaft or pedestal mount rocker arms allowed.
13. Racing valve job permitted. Machine cut only.
14. No porting or polishing.

Water Pump
1. No electric water pump.

Fuel pump
1. Block mounted mechanical pump only.

Flywheel
1. Steel flywheel only. Minimum 25lb.

Clutch
1. Standard stock type disc and pressure plate only.
2. Must use diaphragm type pressure plate with solid face.
3. 10" minimum diameter.
4. Pressure plate and disc must be steel.

Distributor
1. OEM type HEI or stock type single point distributor only.
2. After market coil and module allowed as long as they mount in stock
location. No chip in place of module allowed.
3. No ignition boosters.
4. No dry cell battery pack to ignition.

Intake
1. Any single four barrel intake.
2. Any carburetor spacer permitted.

Carburetor
1. Holley single line 600 CFM, single pump, vacuum, secondary four barrel only.
2. No secondary metering blocks.
3. No cutting of choke housing.
4. No porting or polishing.
5. Choke linkage and butterfly must be removed.

Weight
1. 3300 lbs. minimum with driver.
2. 1 lb. per green flag lap burn off allowed for feature only.
3. All weight must be bolted on and painted white.
4. Weight must be posted on left c pillar.
5. Track retains the right to adjust the weight in interest of competition should it deem necessary. Any question about weight should be asked before the feature not after.