09-25-2009, 11:25 AM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine: # 757 ERA 427 SC , 482 Al. big block
Posts: 898
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Not Ranked
Partrick ... guess I should have been more specific .... my fault. I think that most of the guys running the E brock heads have had them modified by some sort of CNC program , i.e Keith Craft and others . This gets the exhaust up in the range it needs to be . The problem I had on the iron heads was that there wasn`t enough meat in the ports ( without major welding ) to get it where it needed to be , therefore the dual pattern cams .
You are 100 % correct on the stock heads from E brock . Maybe Keith or someone else can speak more intelligently on the modified flow figures than I can .
I also remember my cylinder head guy telling me there was a ratio between intake and exhaust flow that should be maintained .... the difference being that exhaust gases were being pushed out ( and pulled by the collector ) and to go beyond that ratio would hurt overall performance . No data to back that up , just what I was told ... but my heads always outperformed everyone else`s on the track ... flowing everything as a unit is the only way to go . My guy always went for velocity and equal flow first and then total flow second .
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