2M6127000 3-1/2" bore piston rings chr/moly. STD

Designed for late 1978 to 1984 1340cc Shovelhead engines, these Hastings chrome-moly piston rings are the go-to choice for a top-end refresh. This set is for standard 3-1/2 inch bores with a 3.498 inch diameter and features 1.6mm top and middle compression rings paired with a 4.75mm oil ring. The oil rings utilize a three-piece flex-vent design to maintain a clean cylinder wall without excessive drag. Sold as a pair for a complete engine set, these rings are engineered to handle the heat and pressure of a Big Twin. Always verify your piston groove dimensions before installation to ensure these high-quality rings seat correctly for maximum compression.