





Kibblewhite Valve Guide Ref. 30-31170 — Designed for the intake of Cross engines, this C674 bronze (manganese) guide offers a simple and precise solution for restoring or preparing valve seats. Made in the USA, it adheres to strict KPMI® tolerances while remaining softer than premium C630 guides, making boring and seating easier.
Ideal for preparations and maintenance operations where quick boring and controlled finishing are sought. Note that this C674 offers improved machinability and seating but has reduced strength and longevity compared to C630 nickel-aluminium bronze guides. Check the dimensions before installation to ensure compatibility with your cylinder head.