4244020 2-3/4" bore piston ring set. +.020"

Getting the ring seal right is critical on these old side-valves. This Hastings piston ring set is designed for a 2-3/4 inch bore with a .020 inch oversize. These are the late-style rings, specifically for 1950 to 1973 45-inch Flathead models, as well as 1952 to 1956 K, KH, and KHK 55-inch Flatheads. The set features 1.6mm gray iron parkerized compression rings and 4.75mm three-piece flex-vent chrome oil rings. Just a heads-up: these won't fit the early 1929 to 1949 pistons which used thicker rings. Always measure your piston grooves before ordering to ensure a perfect fit. Hastings is known for quality, and these rings provide the dependable tension needed for a fresh rebuild.