946431 Replacement 45" Flathead piston kit. +.060"

Keeping a 45-cubic inch Flathead running strong often means going to a larger oversize during a rebuild. This MCS piston kit is a .060 inch oversize, designed to fit all 750cc Side Valve models from 1929 to 1973. These cast aluminum pistons are an excellent choice for a stock-style rebuild, providing a reliable replacement for tired original components. The kit is sold as a set and includes the pistons, wrist pins, retainers, and rings. Because these are for vintage 45s, a knowledgeable mechanic should always verify the suitability of all parts during the assembly process. Proper break-in and riding procedures are a must to ensure these pistons perform correctly in your WLA, Servi-Car, or other classic 45 model.