10-SC494 KPMI, cast iron valve seat. 49.40mm OD

If you are restoring a vintage Knucklehead, you need parts that can handle today's fuels. These U.S.A.-made cast iron valve seats from Kibblewhite Precision Machining are designed for use with leaded and unleaded fuels, including modern ethanol and methanol blends. This seat features a 49.40mm outside diameter and a 38.10mm inside diameter, making it the correct fit for 1936 to 1947 Knucklehead models. The material is suitable for both intake and exhaust positions, offering excellent thermal characteristics and high resistance to micro-welding. Each seat is machined with a leading edge to make the press-fit installation into the cylinder head much smoother. These are sold individually and represent a significant upgrade in durability for classic iron.