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SuperTech Black Nitride Exhaust Valves For Acura K20A2 / K24A2 - HEVN-1021F-8 FITMENT For Acura - K24A2For Acura - K20A2 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 (o...

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