Only for 88" motors, Can be used to repair an existing 106" stroker engine, 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, Made in the USA, Fuel-injected motors will require recalibration of the fuel-injection system., This project requires a skilled technician. It is the responsibility of the person assembling the parts to check all clearances and assembly specifications.