INCONEL – NICKEL BASE ALLOYS: This Nickel base alloy material is used for exhaust valves in engines that reach very high temperatures and its use is growing with the application of turbos and superchargers. Stellite seat. The Stellite deposit on the seat of the valve is mad eto reduce oxidation and corrosion to a minimum. This special alloy increases the life of the valve and it is especially recommended for high performance or lead free petrol engines Chrome Plated valve Excellent at high temperatures Seat Hardened High Flow Design Sold per piece Suitable for engines: 312A1 198A40000