Replacement 3-7/8" Bore Cylinder & Piston Kit For S&S 106" Stroker Kits For 1999-'16 Big Twins. - Wrinkle Black FinishThis cylinder and piston kit for S&S 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 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