2M6127020 3-1/2" bore piston rings chr/moly. +.020"

For late 1978 to 1984 1340cc Shovelhead engines requiring a .020 inch oversize, these Hastings chrome-moly rings offer a precision fit. Designed for the 3-1/2 inch bore Big Twin, this set includes 1.6mm compression rings and a 4.75mm oil ring. The chrome-moly material provides excellent wear resistance and heat dissipation, which is critical for air-cooled Shovelheads. Sold as a pair, this set covers both the front and rear cylinders. Builders should always check their piston groove heights against the ring specs to ensure a proper fit, ensuring the engine maintains peak compression and minimal oil consumption for years to come.