94-1401X 4-1/8" bore piston ring set. +.010''

These plus .010-inch oversize chrome-moly piston rings from S&S are engineered for 4-1/8 inch bore Super Sidewinder Plus engines, including Evolution and Twin Cam versions. Sold as a set for two cylinders, they are the go-to choice for refreshing the top end of a high-performance S&S motor. Proper installation requires careful attention to the ring gap to avoid compression loss or mechanical failure. Following the S&S recommendation of .004 inches of gap per inch of cylinder diameter ensures the engine runs efficiently. These are high-quality replacement components designed to meet the rigorous demands of large-displacement Harley engines and maintain long-term durability.