Currently the port I described here has a csa at the valve of 3.6" and on my bench flows 497 cfm @ 28". I have not flowed it without a valve yet. So I don't really know how efficient it is.
Don Johnston
DCI MOTORSPORTS INC.
330-850-5050 shop
330-628-3354 cell
Designer of the DCI Tiger Heads and the NEW DCI Ram Air 5 Heads !!!!!
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