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Check StockWe 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. Type: Ex / In Material: C630 Bronze Quantity: Pkg. of 1 Description: 0.500 B: 0.485 " C: 0.770 " D: 0.870 " E: 0.433 " F: 0.2347 " G: 0.4463 " Diameter(s): +0.010" Valve Guide Seals: Use O.E.M.