These Extreme Flow Performance Valves are for road and racing 4G63's, they are engineered for high rpm and high hp. These ND valves outperform any other valve on the market today. Their Nitride Coating is perfect for High Temperature (and run cooler which improves valve life) large turbo applications.
Intake and Exhaust Valves are One Piece Forged, High Temperature, High Nickel, Inconnel Alloy. Valves are CNC finished to strict tolerances making these valves the choice for the most demanding race classes.
Inconel 751/Nimonic - These Nickel based alloy materials are used for Exhaust valves in engines that reach very high temperatures and its use is growing with the application of turbos and superchargers.
These valves can be fitted to your 4G63 head without the need for new valve seats. The standard seat can be cut for this larger item without compromising integrity.
(Price Shown is per Valve)