This cylinder and piston kit for S&S Cycle 106" stroker kits may be used to replace the stock cylinders, when building a 106" stroker engine Also handy for repair of an existing 106" stroker engine. Cylinders are finished with a durable wrinkle black powder coat that matches the stock engine finish. Kit includes S&S Cycle 3-7/8" bore cylinders and forged stroker pistons for 4-1/2" stroke flywheels, rings, wrist pins, and head and base gaskets. For best performance, appropriate camshafts, performance air cleaner, performance exhaust and fuel system tuning are required.