Machined set of steel main caps, featuring a 4-bolt center main. A must for high-revving race engines! The two outer bolts (included) of the center main are 7/16". Thrust washer surface is cut into the cap but must be finished to size. Fits all 1300 A+ or Austin America blocks. Line-boring is required for installation. Set includes all three (3) caps plus locating dowels.
See FOR167 for main cap stud set.