Mini Stock 4 rules

 Body & Chassis

Any stock appearing metal bodied four cylinder car or truck – 1965 through current year.

You may run fabricated doors and front fenders, but they must appear stock and be securely fastened. Doors and fenders must be steel or aluminum. The roof, roof post and rear quarter panels must be stock. This means no modification.

Stock appearing bumpers – front and rear. After market nose piece allowed. MUST MATCH MAKE OF CAR. (If available)

Entire floor pan and firewall must be in one piece. FLOOR PAN MUST NOT BE CUT.

Boxed-in interiors permitted behind the driver’s seat, but must have a removable inspection panel on the right side. Do not box-in the area beside the driver’s compartment.

The front firewall must have all openings covered incase of fire or fluid leak in the engine compartment. The rear firewall must be covered with sheet metal or aluminum to separate the driver’s compartment from the fuel cell area, but the existing firewall remains intact. Don not gut the inner trunk, leave as much as possible.

A fuel cell is mandatory. It must be in a steel container and properly fastened.

The battery must be securely braced and separated from the driver.

The front, main and rear chassis rails must remain in the car, but you may run tubing on the top of the rails to secure the roll cage. The front and rear chassis rails may be replaced with tubing, if damaged.

The sway bar may be connected to this tubing, but no other suspension components.

You may tie the unitized body together. Absolutely no bracing under the car.

All cars must maintain the stock wheel base. Rear wheel drive cars only.

Must have make of car on the right side and C.C. on the hood or front fenders.

Rear spoiler height is 6 inches maximum on top of the trunk lid. No side spoilers. No roof mounted spoilers.

Windshield is optional, if removed, you must have three bars on the driver’s side, along with protective screen. No front side door windows allowed. You may fill-in rear side openings, if applicable. All other glass must be removed.

Remove all the plastic and trim that could cause debris from getting in the track.

Cars must weigh one pound per C.C. with the driver after the race. 2000 lbs. minimum and 2400 C.C. maximum.

Engine

Engine Specs

Engine must be in stock location, this means stock height and set back. You may run solid motor mounts, but they must be stock size.

No decking allowed on the block, must be factory production steel block. All components of the engine must be stock production for the serial number of the block, unless otherwise specified.

Must run a stock oil pan. May relocate oil filter. No oil cooler.

Engine may be balanced, but no stroking or de-stroking of the engine. Engine can be bored to the maximum C.C.

Stock crankshaft and rods. No knife cutting, polishing, or lightening of any kind.

Stock type pistons only. OEM type after market permitted.

Stock type clutch and flywheel. May surface only.

Stock production head and intake. No porting or polishing. No spacer between the head and the intake. No fuel injected parts of any kind. No factory dual plug heads. One spark plug and two valves per cylinder maximum.

Stock size valves – no cutting for valve springs. No after market double valve springs. May use factory stock double valve springs.

No cutting the lifter boss, for the purpose of making a solid lifter. No lash caps.

After market timing gear allowed to match cam key type. No external adjuster. No roller cam or rockets. Must run factory stock lifters. 450 maximum lift cam.

May run header or cast – iron exhaust out.

May run a stock carburetor or Holley 500 CFM (4412). On the Holley, no modification except for choke housing. MUST PASS THE TRACK TOOL.

Maximum one inch spacer allowed to fit the carburetor to the intake, with the Holley carburetor. Electric fuel pump permitted.

Must run a stock distributor and factory stock ignition system. No magneto and no dual point distributor.

Transmission and differential – stock manufactured. Locked rear end permitted. Transmission must have all forward and reverse working gears.

All cars must have a scatter shield and / or approved bell housing.

Suspension

Shims allowed on rear coil springs only. Lowering blocks permitted.

Shocks must bolt in the stock position. No adjustable shocks.

Springs must be located in the stock position. You may run after market springs, but you may not modify the spring bucket in any way. No coil springs attached to the shock.

No screw jacks, wedge bolts, or adjuster cups. No shackles. No adjuster of any kind.

Strut cars must run stock or OEM replacement components, may brace top of tower.

Stock front and rear sway bars only, no adding of additional devices. No adjuster allowed.

Any steel wheel 8” W maximum. One inch lug nuts recommended. No bead locks. No wheel flares. Safety beads recommended.

Racing fuel only. No alcohol. No additives.

Cars will be inspected. Track official has the final approval.

A tire rule will be enforced. D.O.T. approved street radials. Any 13 or 14 x 8” W.