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David David is offline
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Join Date: Apr 2002
Location: Houston (Clearlake), TX
Posts: 8,720
At the port opening where it mates to the intake manifold, it's 32mm. Before it makes the bend to the valve, it's 36mm.

When I opened the ports for the Carrera manifold, I set the heads up in a mill and cut a 40.5 to 36mm taper to match the new manifold to the lower port diameter.
2014 Cayman S
2011 Cayenne Turbo
1979 930 (475 rwhp at 0.95 bar)
Old 02-02-2010, 07:05 PM
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