These top end kits include a set of S&S Shovelhead-style cylinder heads, a pair of S&S stock bore cylinders 3-7/16" for 74" engines, Wiseco cast 8:1 compression pistons complete with rings and wristpins, manifold clamps, manifold seals, all required hardware, and gaskets This 74" top end kit include Wiseco 92-2500 series 3-31/32" stroke pistons and o-ring style cylinder heads Pistons are pre-fit to the cylinders, so there is no machine work to be done and very little down time