This 3-1/2" bore cylinder and piston kit can be used to build an 89" stroker engine, or the replace the cylinders and piston in an engine with an existing 89" S&S^® stroker with S&S Super Stock^® cylinder heads. The kit contains S&S 3-1/2" bore cylinders, S&S 3-1/2" bore 4-5/8" stroker pistons,