Cluth size for Late Model Sportsman corrected to 7 1/4 inches.

ARCA FIGURE 8 DIVISION

BODY, A. STRUCTURE: (This is a clarification from 4-19-15): Front nosepiece cannot extend past front bumper unless running a stock-type nosepiece.

ARCA ENDURO/FACTORY STOCK DIVISION

ENGINE/CARB/TRANSMISSION/REAR END: (Clarification): One 2 or 4 barrel stock-type carburetor only. NO ram-horn “corvette”-style manifolds.

ARCA STREET STOCK DIVISION

EXHAUST: (This is a clarification from 4-19-15): Maximum exhaust pipe 2 inch I.D., measured 2 inches from exhaust manifold/header collector and beyond.

SUSPENSION: (Add): Trailing arms must mount to rear end in a solid fashion (heim allowed) and no part of the trailing arm mounting may freely rotate around the rear end.

ARCA LATE MODEL SPORTSMAN DIVISION

CLUTCHES: (Add): Multi-disc clutch permitted—add 50 lbs. No direct-drives. Conventional clutch mounted to flywheel only will be permitted. NO carbon fiber or non-standard material clutches. Minimum clutch diameter is 7 1/4 inches. NO “slipper” or “centrifugal” clutches allowed.

SUSPENSION: (Add): Trailing arms must mount to rear end in a solid fashion (heim allowed) and no part of the trailing arm mounting may freely rotate around the rear end.

SUSPENSION: (change): Any aftermarket fabricated perimeter or straight-rail frame permitted.

BODY: (Clarification): No offset, outlaw or down-force bodies.

WHEELS: (Delete): add 50 lbs. for “wide-five” bolt pattern wheels.

WEIGHT: (Add): Maximum 56% left-side weight for straight rail chassis.

ARCA LATE MODEL DIVISION

BODIES: (Point of emphasis): No more than 2 inch drop permitted at any point on roof.

SIDE WINDOW OPENINGS: (Point of emphasis): Side window openings minimum of 12 inches high by 22 inches wide.

FUEL CELL: (Re-wording, change): All fuel cells to have steel plates mounted in front of and rear of cell, minimum 1/8 inch thickness.

ROLL CAGE AND CHASSIS: (Change in tolerance measurement): Measurement from bottom of the 3-inch frame rail to top of rear roll bar is minimum 39 ½ inches, with ½ inch tolerance (was ¼ inch).

**2016 RULE BOOK TAKES PRECEDENT OVER THIS PAGE.