You can get the same flow rate (ok, really close) with ported heads. I don't really know why you would want the extra valves.
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1997 Mustang GT "The Freak" - 13.80 @ 101.70, 2.07 60'
1995 Honda VFR750 - not much @ really fast (actual data pending.)
1964.5 Mustang 289
Rice Haters Club Member #13
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