946416 Replacement 74" Flathead piston kit. +.010"

Rebuilding a classic 74-cubic inch U-model Flathead requires precision parts that respect the original design. This MCS piston kit is an OEM-style replacement designed for 1937 to 1948 1200cc Side Valve engines with a 3-5/16 inch bore. These cast aluminum pistons are finished to a .010 inch oversize, making them perfect for cleaning up cylinders that have seen some wear. The kit is sold as a set and includes everything you need for the install: pistons, wrist pins, retainers, and a fresh set of rings. As with any vintage engine overhaul, it is important to verify all clearances and follow a proper break-in procedure to ensure these pistons seat correctly and provide long-lasting service in your classic Big Twin.