The part I am wondering about is where he takes the total potential HP on a 338 cfm head and uses the 91% of the exhaust flow and only comes up with 639 horsepower. (703 x 91%)
No Pontiac head I know of has a 91% intake/exhaust ratio so the typical Pontiac head is going to be worse.
But we have all seen 340 cfm Pontiac heads making far more than 640 horsepower.
Am I missing something ?
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