This 3-5/8" big bore kit may be used to replace the cylinders and pistons of an S&S Cycle SH93 high compression engine or a stock Shovelhead engine that has been upgraded with an S&S Cycle 93" Hot Set Up Kit . This kit may also be used to upgrade an engine with an S&S Cycle 84" stock bore stroker kit to 93". Stock crankcases must be bored to accomodate the 3-5/8" bore cylinders, The kit includes S&S 3-5/8" bore cylinders, 3-5/8" bore forged pistons with rings and wristpins, head gaskets, base gaskets, exhaust gaskets, and instructions. Compression is 9.1:1. The cylinders are longer then stock , so longer pushrods, and manifold must be used. High strength engineering-grade grey cast iron Excellent wear resistance Durable powder coat finish 3-5/8" Bore Gloss black powder coat finish Cylinders will not fit OEM panhead engines