DescriptionWe choose to use the copper based C63000 nickel-aluminum bronze as a material to make our bronze valve guides because of its ideal characteristics for the application. The 5% nickel content provides superior resistance to wear, and the approximately 80 percent copper content delivers outstanding heat conductivity. KPMI® guide profiles are designed to have minimal effect on the airstream while maintaining critical cross sectional thickness in high temperature areas, which promotes high performance and endurance.KPMI® Guide Sizing Tool Flyer DownloadClick HereKPMI® Seal Catalog DownloadClick HereQuantityPkg. of 1MaterialC630 BronzeTypeExhaustOutside Dia.: (G)0.6280″ / 0.002″A0.525″B0.580″C0.955″D1.420″E0.680″F0.3105″