TAPPET CONVERSION BOTTOM SHIMGuide 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 airflowWhere 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 mai
Specification: Material is mill certified, guaranteeing a consistent premium grade of material in every production run; this unique blend of materials create a guide that is extremely resistant to galling, which allows for tighter clearances than other materials. This reduction in clearance creates a better valve-to-seat seal, and superior oil controlSold in sets of two, unless noted otherwise.