Supertech +1mm Intake Stainless Steel & Inconel Exhaust Valves Set Supra JZA70 Soarer Z30 1JZ-GTE

Supertech intake valves are made exclusively from an enhanced versions of EV8 (21-4N) steel. This is the highest grade of steel available and provides the strength to withstand just about any application. These valves are black nitride coated, which is a hardening treatment that has been steadily growing in popularity over the last several years.

Supertech exhaust valves are made from EV16 (21-8N) or EV8-Nb/w for greater strength at higher temperatures