94-1212X 3-5/8 bore piston rings. +.020"

This S&S chrome moly replacement ring set is designed for two cylinders and fits Evolution and pre-Evolution engines equipped with a 3-5/8 inch big bore kit. These rings are specifically sized for .020 inch oversize bores and feature 1.5mm compression rings and a 4.2mm oil ring. They are a perfect fit for S&S kits and some Axtell big bore setups using the same groove dimensions. When installing, it is critical to set the correct ring gap to avoid seizure or compression loss; S&S recommends a gap of .004 inch per inch of cylinder diameter for street engines. For this 3-5/8 inch bore, that works out to approximately 0.37mm. These high-performance rings ensure your big bore motor stays sealed and powerful.