The deal is not that they make significantly more power per CFM but the fact that they out flow wedgies like you wouldn't beleive

What wedge factory head can be easily made to flow 400+ CFM ? I have seen ported factory issued Hemi heads make 1000 HP, no 906 or even max wedge can even come close. To get 1000 hp wedge heads you have to look to the latest greatest and most highly developed heads out there not a factory head that was desighned almost 50 years ago.

I am not causing global warming, I am just trying to hold off a impending Ice Age!