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SuperTech Inconel Exhaust Valves For Volkswagen R32 VR6 - VWEVI-1044SS-6 FITMENT For VW - R32 VR6 Description Production of our racing valves begins with a one piece forging, where the head of the valve is forged under a slow two step process to keep a good material grain flow. The forging is then CNC machined in several steps to ensure the precision of the final dimensions. We then do another heat treatment for stress relieving followed by a nitride hardening treatment (or coating process depen...

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