20-21029M KPMI, intake valve guide. Manganese. +.010"

For 2017 to 2023 Milwaukee-Eight heads that have significant wear in the guide bores, this Kibblewhite manganese bronze intake valve guide is the solution. It features a .010 inch oversize outside diameter to ensure a tight, reliable press fit in heavily used or previously repaired castings. Manganese bronze is an ideal material for those looking for a balance of performance and ease of installation, as it can be reamed to size quickly and finished using standard shop tools. This guide offers great lubricity and helps pull heat away from the intake valve efficiently. While the standard reference outside diameter is 0.4750 inches, this specific guide gives you the extra material needed to save a set of heads that would otherwise be out of spec.