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The professionals at B&B Automotive Machine in Lynbrook, NY, unshrouded the valves a bit on both the intake and exhaust side, along with a slight reshaping beyond the plughole. This will increase flow in most applications, however it will also increase chamber size a bit, so weigh out your options before grabbing the grinder. In our boosted application slight chamber size variation is not of concern, where added flow is significant. View Related Article
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