Black Diamond® valves feature one-piece stainless steel construction with stellite tips and special impregnation to improve wear properties and reduce friction; White Diamond® valves feature one-piece construction and hard chrome stemsAll valve guides are made of Ampco-45, a high-performance compound with 80% copper for great heat conductivity and 4-5% nickel for wear resistanceSpring sets contain springs and titanium upper collars; keepers and lower collars included as requiredValves and guides are sold each; spring kits come complete for one motorMade in the U.S.A.
