Thanks for the flow number here Paul.
The issue with getting the 4 heads Intake port to top 300 cfm is that there push rod buldge intruding into the flange area is more of a restriction then the D port heads since they where born with bigger diameter push Rods..
If you raise the roof up to near the top of the casting and carefully use a 1.86" valve bowl throat then 330 cfm @28" can be had.
But then if your not running a Intake for a high port head your dealing with a ton of welding and rework on your Intake to just match the new port height no less get the needed expansion rate on the way back to the Plenum.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
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Two dry rotted 14 x 10 Micky Thompson slicks.
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Two pairs of brown leather flip flops, never seen more then 2 mph.
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