Black DiamondÖ valves are CNC machined from one-piece forgings of EV8 Stainless Steel Black DiamondÖ proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wear Made in the U.S.A. Must use Kibblewhite« Lightweight Valve Spring Kits when installing Black DiamondÖ Valves.. VALVE INTAKE1.980"TC05-17
