Flat Rock Speedway

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.