Chev 350, Ford 351 (Windsor) or Dodge 360 ci engine. Open chamber heads only.

Maximum compression ratio of 9.0:1 (9.0:1 = 9.0:1)

Heads must have had an original combustion chamber of:

Chev 76 cc

Mopar 67 cc

Ford 60 or 69 cc (Depending on the piston)

- GM head - Maximum intake diameter of 1.94", maximum exhaust diameter of 1.50".

- Ford head - Maximum intake diameter of 1.84", maximum exhaust diameter of ï.55".

- Dodge head - Maximum intake diameter of 1.88", maximum exhaust diameter of 1.5I7".

Steel retainers must be used.
Stainless steel valves are allowed.

Minimum weight for the Piston and rod assembly is 1350 Grams.

Dished or flat top, cast or forged, 4 eyebrow pistons.

CAM - Stock Lift. Any duration with a Maximum Valve Lift as follows;

No, dry sump systems

Valley trays may be used

Any carb may be claimed by the speedway for the value of a legal replacement Carburetor, including taxes
Two return springs are compulsory
A 1 and 1/8" thick spacer plate is permissible
GM and Mopar are allowed two stock type gaskets, one thin and one thick
No carb hats or air deflecting devices are allowed

Stock Air filter housing only
No Air Boxes allowed

No variable ratio transmissions allowed

A minimum, 4-point safety harness no older than 5 years, fastened to frame or roll cage

A Snell 85 registered helmet is required to be worn on the track

A minimum of 3 inches of clearance between the drivers helmet the overhead roll cage bar is required

All glass except windshield must be removed
Windshield must have safety glass or Lexan

Quarter windows and back windows are optional, and must be made of the same material as the windshield

Drivers window net is mandatory

Must have a minimum 2 1/2 lb.. fire extinguisher in the race car, securely fastened, within easy reach of the driver, and with recharge date no later than January of current year.

If battery is in drivers compartment, it must have a protective covering and be securely fastened to the floor

Every car must have a kill switch (shut off switch), located on or near the window opening on the drivers side (where windshield wiper was originally mounted or in front of drivers window opening)

Steel , fiberglass, or aluminum body or kits allowed

Safety retainers on hoods are required
Trunk lids must be functional
Body must be centered on frame and retain its stock appearance, dimensions and angles
Must have all doors, fenders, trunk lid and hood on the car when the race day begins

A Complete steel firewall and floor boards around the driver of 22 gauge steel or better is mandatory

Aluminum is allowed elsewhere in the interior but steel is recommended for optimum fire safety

An after market rubber nose and tail "cones" are allowed, providing they match the body

No ground effects are allowed

A maximum 5" high x 60" wide trunk deck spoiler is allowed as measured across the back of the spoiller.
No side boxing of the spoiler is allowed.

No, holes in hood. Hood must fit against windshield. If cowl induction style hood is used it must be sealed off to the engine compartment.

Minimum Ride Height for GM Metric cars = 6" as measured from any part of the frame to the ground

Minimum for all others with longer than 108" wheelbase is 4"

A 5" diameter, maximum, left side mirror is allowed. Mirror must be inside the car body. A Rear mirror is allowed

The back of the drivers seat to the center of the rear housing should measure no less than 25"

Rub rails, must be of flat aluminum and must be flush with the body with bolts countersunk and have no sharp edges

Note: Ford and Dodge power trains may run on a stock GM A Body Chassis. Otherwise car must be GM on GM, Ford on Ford, and Dodge on Dodge

No, mismatching parts

The following body guidelines will apply per the corresponding body measurements templates

"A" Minimum Front Nose Height = 18 "

"B" Maximum Front Overhang = 45"

"C" Minimum Window Opening = 16"

"D" Maximum Rear Window Length = 37"

"E" Minimum Body "Side Panel Clearance" to the Ground = 4"

"F" Maximum Rear Bumper Height = 17"

"H" Minimum Roof Height = 47"

"J" Minimum Door Height at the Rear = 35"

"K" Maximum Quarter Panel Height at the Rear = 35"

"M" Maximum Rear Deck Length = 23"

No roof rails or wings

Side windows may not be filled in

No "cut down" body panels

Cars, especially top teams, found outside these guidelines in one or more areas will be penalized and or required to modify to the guideline based on competition.   Top teams should adhere to these rules strictly to avoid penalty.

All panels and windows or windshields must be braced to prevent bowing at race speed, as necessary.

"Mother of Downforce" or other high performance body sytles are not allowed.  Front bumper excepted.

A full 1/8" thick lexan windshield is required.
A rear window is recommended for better performance due to the higher speeds at the facility.

Dodge or Ford running on a GM Metric Chassis must run a full Dodge or Ford Power Train.

Anyone wishing to run Dodge or Ford power on a GM Chassis must receive prior written consent.

Dodge or Ford on a GM Chassis may be subject to weight adjustments to ensure fair competition.

Front quarter fender and side of the nose must remain open for "Driver Contingency Award" sponsors

Top 8" of Windshield, full width, must remain open for the Class Points Fund Sponsor

Bumpers must be used both front and rear. Bumpers can be reinforced from behind.

Click here to view a detailed  Body Template including measurement points.


The top 8" of the Windshield must be kept open for the class sponsor.  In addition the space behind the front right wheel and in fron to of the door numbers must be left open for contingency award sponsors if you wish to participate in the Contingency Awards Program.   See Awards for more information.

Master cylinder must be in stock location.

Stock type aluminum brake drums are allowed.

Braided Steel Brake lines are allowed. 
An adjustable, single line, brake bias valve is allowed in the drivers compartment for adjusting the rear brakes, only.
Drilled Rotors are allowed with weight considerations.  See the "Weights" section of this rule book for more information.

Must have blow proof bell housing or scatter shield around bell housing at least 1/4 inch thick or approved blanket. 180 degrees around, is required on all cars with manual transmission. 
A stock steel flywheel weighing not less than 15 lb is required.
Stock clutch plate, measuring a minimum of 10" in diameter is required. 
No high performancce clutches allowed.

Must be welded directly to the frame of the car.

Roll cage can not be set back on the frame.

Must be four upright pipes joined at top with four pieces of pipe to form a top "hoop".

Uprights must be welded directly to frame and ahead of raised portion for rear wheels.

The bottom of top hoop must be a minimum of 3" above the top of the drivers helmet.

Must extend the full width of the roof so that the roof will be supported on the passenger side as well as drivers side.

A bar from the frame to the driver' s door is required to protect the drivers feet .

There must be three pipes a minimum of l 1/2 inches in diameter and .095 thick on the inside of drivers door between front and rear roll bar.
1 ¾ " recommended.
It is required that a minimum 1/16" plate be welded between or over (covering) these door bars to form a solid mass.

Fuel cell protection bar is required.

Roll cage must have two braces going back to the frame at the rear for support.

Spring wedges may be used in coils.

Single coil springs only may be used. Lowering blocks may also be used.

Any spring may be changed as long as it is the same style after-market or otherwise.

All springs must be in stock location.

Jacking Bolts allowed.

Upper control arm may be cut to allow clearing of the jacking bolt.

Spring pockets may be reinforced or cut out to allow a longer spring. Stock 2 x 3 tubing material may be used to replace the frame from the rear housing to the back.

Wheel base may not vary more by more than 1" from one side of the car to the other.

Stock sway bar remains in stock position on frame and lower control arm. Sway bar may be adjustable at lower control arm.
If chassis came with sway bar on the rear, it may be used, as long as it remains in stock location.

A 6" tubed upper control arm is allowed.

Grandfathered Leaf Spring Cars may compete and may be subject to a competition penalty as necessary.

Ford Crown Victoria or Chev Caprice frame may be shortened to 108".  Frame rails must be at least 54.5 " long if shortened and all 108" rules will apply (eg. ride height, crank height, engine setback. etc.)  

Maximum 45% rear weight.

Cars must weigh 3000 with the driver in position at the end of the race.
Cars without AFCO shocks, Drilled Rotors and Ford Rear End (in a non Ford) may run a 56% left side weight bias.
Cars with a 48" roof height or higher may be allowed additional 1% left side weight.   These cars may have no more than a 1" spacer between the roof and top of the roll cage in order to qualify for the additional 1% left side weight.

Four Drainage holes should be drilled in the bottom of the steel box to not allow gas to lay in the box.

Fuel tank cannot be lower than the middle of the axle tube.

No electric fuel pumps or pressurized fuel tanks.

Must have full 22 gauge steel fire wall between gas tank and driver.

Gas line must be under floor. Regular (81 Octane) gas only. Maximum specific gravity =.765.

Tire for the class is the Hoosier 890 purchased from the CENTRE

Steel wheels, 10" maximum. Larger wheel studs are recommended
Tires are not to extend past the body more than 2"
Maximum tread width of 68" measured from outside of tire to inside of tire

All competitors are encouraged to notify the speedway prior to April 1st of your requirements so that we have enough supply.