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Neil brings up a good point about flow benches. It seems that no two flow exactly the same, and like Neil said, big numbers sell. If anything, mine reads a tad low (or everyone else's reads high, you choose). I do calibrate mine every single time just before I test anything.
28.00" H2O is the test depression that I use, along with the vast majority of people in the industry. Way back when, 10" H2O was the standard, only because we didn't have vacuum motors big enough to pull the big depressions.
One thing regarding head port flow, Porsche heads flow exceptionally well from the factory, across many castings and port/valve sizes. Even the small port heads will flow far more air than needed for any reasonable horsepower requirements. Will they make more power with higher flowing heads? Sure, but in the big scheme of things, they are not the restriction.
Superflow uses an equation to determine what horsepower a given port will support (MAX effort engine, NOT a street engine). 0.257 x cfm@max valve lift x number of cylinders. If you do the math on practically any Porsche engine that we see, the heads are not the restriction.
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