Kibblewhite Offroad Premium C630 Racing Bronze Valve Guide 30-32420

Guide profiles are designed to be as clean and unobstructive to the airstream as possible, while maintaining critical cross sectional thickness in high-temperature areas, promoting both high performance and endurance. In many instances, because of the nose shape, just the installation of Kibblewhite guides with no other modifications will enhance airflow. Where the factory base washer allows for it, guides have a flange that sets the protrusion at a height that allows for correct seal to retainer clearance for the most aggressive cam available at the time the guides are designed. Once the flange touches the head you're home. No time lost stopping to measure guide protrusion several times during installation. In cases where a flange would interfere with the factory base washer fitment, a small decrease in diameter above the purchase area marks the correct guide protrusion.. Very tight concentricity tolerances are held to ensure the best possible geometry between the seat and guide is maintained when the guides are replaced. This means minimal material removal from the seat, time savings, and consistent chamber volumes, when valve jobs are performed with KPMI guides installed.