20-21032M KPMI, exhaust valve guide. Manganese. +.002"

Designed for 2017 to 2023 Milwaukee-Eight engines, this Kibblewhite exhaust valve guide is sized at .002 inch oversize on the outside diameter. This extra material is vital for achieving a proper press fit in cylinder heads where the original bores have become slightly enlarged over time. The guide is made from manganese bronze, a material known for its excellent heat transfer and natural lubricity. Mechanics appreciate manganese bronze because it is easy to ream to size and can be finished quickly with a ball hone. With a standard reference outside diameter of 0.4750 inches, this .002 inch oversize version provides the necessary interference fit to keep your exhaust valves stable and your engine running quietly.