[618jerrys]

Thanks Charles . For general info If anyone is interested here are the intake & outlet measurements for practically all popular aftermarket plenums for the 4.6, SOHC, 2V. All have a 75MM intake opening, but the outlet side of practically all are different in size as noted below. I guess by changing the dimensions there is no patent infrigemnt. Since the plenum outlet is oval shaped all measurements were taken at the longest dimension and widest dimension of the oval. Additionally, I have found all castings of the various manufacture's can vary in size as much as 1MM for the same identical plenum.
Only the plenum outlet dimensions are noted since all have a 75MM intake.

Stock: 61MM X 80MM

Accufab: 63MM X 82MM
BBK: 64MM X 81MM
C&L:* 64MM X 80MM
Dragon: 61MM X 80MM
Granatelli(GMS): 63MM X 80MM
MAC: 65Mm X 81MM
Performance Prod's:* 64MM X 80MM
RPM Outlet:* 64MM X 81MM
Trick-Fkow* 63MM X 80MM

*Denotes: Performance Products manufactures the Power Air Inlet and Trick-Flow Plenums. The Power Air Inlet is produced in China, the Trick-Flow in the US. There is a substantial difference in the quality of the castings.
It is my understanding the C&L manufactures RPM Outlet plenum but I have not verified this as positive.

All of the above measurements were taken from plenums that I have owned, used,modified & tested, mainly from "seat-of-the-pants" performance over the years.