Supertech Valve made in one piece forged stainless steel. Supertech Performance uses mainly SAE EV8 (UNS S63008) for the Intake and Exhaust valve.
Supertech Performance apply's different heat treatments to this material to obtain different hardness and ductility in accordance to application and budget (Street Performance or Heavy Duty Racing).
Supertech use two different kinds of coatings:
A: Chrome coating; widely used in high performance valves.
B: Black Nitrided: this is a hardening treatment that even though it is not widely used as the chrome coating, it has several benefits and is becoming very popular, mainly for European and Japanese applications.
Standard / stock sized valves.
Sold as a 16pc set (8 intake / 8 exhaust valves).