I have a set of 72cc eheads that were cnc ported by SD a few years back. During a freshen up I had the ports polished just to remove the tool marks nothing more. Heads were flowed before and after, picked up 3 cfm intake and 4 exhaust. Car picked up a few .01's and a little MPH also. I know everyone says to leave the tool marks but sometimes I don't listen. In this case I am glad I didn't.
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Tim Corcoran
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