S&S Cycle 106 Stroker Cylinder and Piston Kit For Harley Twin Cam 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. Features: 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 Handy for repair of an existing 106 stroker engine For best performance, appropriate camshafts, performance air cleaner, performance exhaust and fuel system tuning are required