These polished crankcases are intended as replacement parts for existing engines, but may also be used to build large high performance engines. It should be noted that only engines built by S&S Cycle with the specified parts and documentation are considered "emissions compliant". Cylinder deck height of 6.125" and will accommodate 4 1/8" up to 4 3/8" bore cylinders without modification. Kit contains crankcase, hardware, and seals.
S&S recommends using Permatex Right Stuff® for sealing crankcases.