These are a great starting point for any 12V VR6 cylinder head build. High quality Inconel valves. For the price, these are an excellent replacement for stock valves. This is an exhaust valve set for the very highest performance builds. These valves are +1.8MM oversize for maximum flow (machine work required). 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. This is for a set of 6 Supertech +1.8MM oversize exhaust valves.
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