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#21
Yesterday, 03:29 PM
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Just keep in mind that a highly developed induction system on a pro stock motor or a Indy cars motor can see up to a 120” H2O depression.
But this has to be tempered with average numbers also. I don’t know if they still do, but Ford has tested at 65” which is in my opinion why they thought that the oversized intake ports on a Boss Cleveland head where the way to go on street 302 cid motor. Pontiac at least though that those same size ports where good for a 303 motor that could buzz to 8200, but even that was wrong! Just keep in mind that a steady state flow bench test does not show the effects of the cycles that a running motor places on an induction or a exh system. A good marker for making HP in regards to induction system that’s tested at 28” is that for every 100 hp your looking to make you then need .100” of lift at the valve.
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