946429 Replacement 45" Flathead piston kit. +.040"

This .040-inch oversize piston kit from MCS is designed for 1929 to 1973 45-inch Flathead models undergoing a stock 750cc Side Valve rebuild. These cast aluminum pistons are manufactured to match the original OEM style, providing a dependable replacement for worn cylinders. The kit includes everything required for the top-end assembly: pistons, wrist pins, retainers, and rings. It is suitable for all 45-inch Side Valve models produced during this extensive year range. Sold as a kit under OEM number 946429, it is essential to follow proper break-in procedures to ensure the longevity of your vintage engine. This kit is a practical solution for keeping these historic Harley-Davidsons on the road.