Sportster Cylinder Heads - Build-Off
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The valve's guide into head's exhaust runner was contoured, and the runner was ported and smoothed like the intake runner by Dusty Werner. Revolution tested the intake and exhaust flow of each head's runners on their Port Flow Analyzer v3.0. They were able to squeeze 233cfm into the intake runner and 159.7cfm out the exhaust at .600-inches of lift. View Related Article
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