PolyQuad 4 Valve Head: The Best For Both Torque AND Horsepower With Small Displacement?

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Not sure you can attribute that to swirl without having all the information on air velocity as far as peaks, gradients etc as a big loss of power can be shown when those are incorrect even if you arent trying to maximise swirl.

This whole test was done, trying to keep everything else the same.
The original port was done by the same head porter that was trying to make a high swirl version of it. It was also on the most dominant engine at that time.
Velocity was almost the same, Same for cross-sectional areas.
The test was to keep everything the same(or as close as possible), but introduce swirl.

of course that would be the goal but you cant keep everything the same (or very close to it) and just change swirl though can you as its not independent variable or feature/aspect of the port. Its a whole lot more complicated than supposed