10-SC420 KPMI, cast iron valve seat. 42mm OD

For custom cylinder head work, these Kibblewhite cast iron valve seats provide the quality and reliability you need. Made in the U.S.A., these seats are designed to perform with leaded and unleaded fuels, as well as methanol and ethanol blends. This universal seat features a 42mm outside diameter, a 32mm inside diameter, and a height of 11mm. The cast iron material is chosen for its superior thermal characteristics and resistance to micro-welding, making it suitable for both intake and exhaust valves. Each seat is machined with a leading edge to ensure a smooth and accurate press fit during installation. These seats are sold individually, offering a professional-grade component for any custom Harley-Davidson or high-performance engine build.