05-02-2014, 11:59 AM
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CC Member
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Join Date: Oct 2003
Location: Queen Creek,
AZ
Cobra Make, Engine: Midstates, Vette suspension, Baer 6P brakes, 540 cid Chevy, Haltech Fuel Injection
Posts: 906
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What Inner Diameter (ID) are your louvered Hedmans? If the ID is large enough, louvers vs perforations won't make a difference. Turn the louvers downstream, though. That reduces the thickness of the boundary layer and increases the effective ID where the bulk of the flow occurs, as compared to pointing the louvers into the flow. With a 331, if the ID is nominally 2.5inches or larger, you will be OK.
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E. Wood
ItBites
10.69 @ 129.83mph - on pump gas and street tires
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