588722 KPMI, exhaust valve guide. Cast iron. +.010"

When you are rebuilding a Milwaukee-Eight head for the long haul, you want materials that have stood the test of time. These Kibblewhite cast iron exhaust valve guides are the industry standard for a reason, offering maximum durability and wear resistance that is essential for high-mileage touring. This specific guide is a +.010" oversize version, designed for 2017 to 2023 M8 models where the head requires a slightly larger fitment than stock. For reference, the standard non-oversize dimensions feature a 0.4750" outer diameter and a 1.655" overall length. It is a precision-machined component that ensures your valvetrain stays stable under the heat and stress of the road.