Made from lightweight EV8 stainless steel one-piece forgings that are heat treated using a proprietary heat treatment process for exceptional strength and durability. Skunk2 valves feature a special hardened tip which will not deform or gall when used with high-lift camshafts. Though many aftermarket valves look similar, Skunk2 forged valves feature specially designed valve head profiles to optimize airflow when used with stock or performance valve jobs. After CNC-machining and polishing, a black nitride coating is applied to reduce friction and increase wear resistance.