Cylinder and piston kit can be used to build 84", 86" or 88" stroker engines, or to replace the cylinders and piston in an engine with an existing S&S® stock bore stroker kit. Can be used in engines with 4-1/2", 4-5/8" or 4-3/4" stroke flywheels. 4-1/2" Stroke - 84" - 8.4:1 Compression 4-5/8", Stroke - 86" - 9.4:1 Compression 4-3/4", Stroke - 88" - 10.8:1 Compression. Includes 3.4375" bore high tensile cast iron cylinders, 3.4375" bore forged pistons with rings and wristpins, head gaskets, S&S stainless steel head bolts with washers, base nuts and base gaskets. Made in the U.S.A..