full width of bumper. Bumper must have no sharp edges.
Must be made of round steel tubing only, with a maximum diameter of 1 1/2" by .095' wall thickness for main bumper and all bracing. It must consist of two rails, an upper and a lower, which must have four sockets and horizontal support bars attaching it to the frame, These rails must also be a minimum of 10' apart and a maximum of 16" measured from top to bottom and maintain that measurement for a minimum width of 64" or a maximum width of 86". The rear bumper or any side bars cannot extend past the outside of tire sidewalls on both sides. It also must have an 18" center measured from the ground up to middle of bumper. The rear bumper may not exceed 52" In back of rear axle centerline. No V-shaped bumpers, crash area must be flat and vertical for the full width of bumper. Bumper must have no sharp edges.
Must be made of round steel tubing only, with a minimum diameter of 1 1/2" by .095" wall thickness. All bracing must also be a minimum of 1 1/2" outside diameter by .095" wall thickness, Maximum wall thickness must be .095" with no solid bars or ballast added Inside. Rub rails must be outside of body panels but may not exceed the outside edge of the tires. The exception is the left rub rail only, which may extend an absolute maximum of 2' outside the left rear tire sidewall. Rub rails must be rounded with no sharp edges and bent at a gradual 90 degrees and must protrude a minimum of 6' back in past the body. Rub rails must be a minimum of 50"iong, end to end. Single bar rub rails only.
One fuel tank with a maximum of 22 gallon is mandatory, used for gasoline only. Fuel tank height will be 12' minimum from the ground to the bottom of the tank. Tank must be centered Inside of the frame rails and be rectangular or square in shape on all sides for measuring capacity. Fuel tank must be fully encased in a steel container with a minimum thickness of 20 gauge. An optional aluminum container may be used with a minimum thickness of .060". Fuel tank must be fully foamed with a minimum cut out for filler. Cut out may be no more than 6' wide by 10" long by 7" deep. Fuel lines must siphon from top only, No fuel lines bigger than #10. No auxiliary tanks. No fuel filters with more the 1/2 quart capacity. Fuel tank vent line must have an inline one way valve for the prevention of fuel spillage. Only one carburetor fuel log will be allowed and is limited to a maximum outside diameter of 1'.
Muffler is not mandatory. If one is used the exhaust must exit past the driver and must be directed to the rear of the car.. No pipe may face outside the car. Any manufacturer of exhaust header is allowed, but header material is limited to steel or stainless. No crossover pipes are permitted connecting the two banks of cylinders.
Any ballist weight must be mounted within the vertical planes formed by the frame rails, must be securely
fastened, and must remain stationary while racing.
One oil cooler, and one passenger car size battery will be the only exceptions allowed to be mounted outside the
TIRES AND WHEELS
Will be allowed to run any tire or any steel or aluminum wheel, up to and Including 92". Beadlocks allowed. No plastic wheels. Maximum tire size will be 29"x 11" The right rear tire softness will be 38 American Racer minimum.
weights are taken with driver and no fuel added after race is finished. Must weigh 2500 lbs. Track scales will be
the official scales.
This class is reserved for North American passenger car V-8 engines with cast Iron blocks and cylinder heads. All engine parts must have casting or part numbers
on them for Identification. All engines must maintain stock bore and stroke combinations.
Engine Maximum Overbore
Chevy 350 ci., 4.00" bore x 3.480' stroke +.070"
Chry 360 ci 4.00" bore x 3.578' stroke +.0200
Chry 340 Ci 4.04" bore x 3.313' stroke +.0600
Ford 351 ci 4.00" bore x 3.5' stroke +.0601
A 4 cu. in. wear allowance is allowed for all manufacturers
Engines must remain stock as manufactured with the following exceptions,
May run a sealed 602 crate, Following the DIRT rules.
The engine block and all internal parts must meet stock specifications for Its make. No Bowtie or other performance type blocks allowed. Dart *LittleM" sportsman block, part #3115111 is allowed.
Cast iron OEM stock production heads or 180/200 DART Iron Eagle heads, straight plug or angle plug),-only. Chevy bow-tie, Chrysler W-2, and Ford performance heads are allowed providing they