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We 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 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. Note: KPMI Triumph valve guide numbers ending in "S" use a special KPMI valve stem seal. The OEM guides did not use a seal. The guide on the left of the photo shows the OE style top, and the guide on the right shows the "S" style top.