Seller notes

VALVES, VALVE GUIDES AND SPRINGSExtensive R&D on all applications to provide high-performance components that last longer than OEMBlack Diamond valves are one-piece forgings made from 21-4N high-performance stainless steelTrademarked Black Diamond treatment provides a stem that has a longer life capacityAll valve guides are made of Ampco-45, a high-performance nickel-bronze material that provides excellent thermal and wear propertiesSuper-clean silicon wire used in valve springs is ground, not s...

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