Supertech Black Nitride Exhaust Valves for 4G63
Supertech valves are made from one piece of forged stainless steel and go through a special heat treatment process that obtains the right amount of harness for each engine to ensure the ultimate valve for your performance motor.
1992-2006 Evolution I-IX
1990-1999 Eclipse GST/GSX
1990-1998 Talon TSi
1990-1994 Laser RS
1991-1993 Galant VR4
Black Nitride Features:
The "Black Nitride" is a hardening treatment that is applied to the whole valve while the chrome coating is only applied to the stem.
The microhardness is higher than the stainless steel base material, keeping good ductility beneath the hard nitrided layer (microhardness is 800HV minimum).
The Black Nitride surface finish is smoother than with chromed stems, having less friction between stem and guide. The higher the engine speed the bigger the power loss due to internal engine friction! The Black Nitride reduces this power loss due to less valve-guide friction.
Valves are sold individually to suit your needs. Please confirm total quantity at checkout. Pricing is for one, single valve.
© All content is property of STM Tuned Inc
© All images are property of STM Tuned Inc
Cancer and Reproductive Harm