20-4099C KPMI, intake/exhaust valve guide. Cast iron. +.008"

For 1936 to 1947 Knucklehead cylinder heads that have seen decades of service, this .008-inch oversized Kibblewhite valve guide provides the necessary material to restore a proper press fit. Cast from high-quality iron, this guide offers maximum wear resistance and durability, which is why cast iron has remained the standard for valve guides since the invention of the piston engine. It is particularly well-suited for long-distance touring where reliability is paramount. With a standard reference outside diameter of 0.6440 inches, this +.008-inch version allows a machinist to save heads that might otherwise be unusable. Precision-machined in the USA, KPMI guides are the trusted choice for serious vintage Harley-Davidson mechanics.