Extensive R&D on all applications to provide high performance components that last longer than OEM
Black Diamond valves are one-piece forgings made from 21-4N high-performance stainless steel
Trademarked Black Diamond treatment provides a stem that has a longer life capacity
All valve guides are made of Ampco-45, a high-performance nickel-bronze material that provides excellent thermal and wear properties
Super-clean silicon wire used in valve springs is ground, not shaved, and X-rayed at regular intervals to check for flaws
Titanium retainers are made from 6AL4V titanium alloy; designed to be the strongest and lightest for ultimate performance
Keepers not included; use OEM keepers and bases, as noted
Valves and guides are sold each; spring kits come complete for one motor and include instructions
All components made in the U.S.A.
