S&S Cycle Top End Kit - 3.500" Bore - 80" Big Twin '79-'84865699808 Product Description Includes a set of S&S Shovelhead style cylinder heads, a pair of S&S stock bore cylinders (3 7 16" for 74" engines or 3 1 2" for 80"), forged 8: 1 compression pistons complete with rings and wrist pins, manifold clamps, manifold seals, all required hardware, and gaskets Pistons are pre fit to the cylinders, so there is no machine work to be done and very little down time Made in the USA