946486 Replacement 80" Flathead piston kit. +.060"

When your 1937 to 1941 80-inch Flathead cylinders have seen some miles, a .060 inch oversize might be exactly what the doctor ordered. This MCS piston kit is sold as a set and includes everything required for a stock 1300cc Side Valve rebuild: cast aluminum pistons, wrist pins, retainers, and rings. These components are designed to replicate the original fit and function, ensuring your vintage motor runs as it should. Proper installation by a mechanic who understands these old Flatheads is key, especially when it comes to checking clearances and managing the initial break-in. It's a solid investment for keeping your classic Big Twin on the road. OEM 22223-30 and 946486.