If you could bump the cfm up to 420 you would open up an endless stream of possibility .... Grateful Dead music plays as the TV commercial starts, smoke clears to show Cheech and Chong doing a massive burnout in a 66 F100.
But if they flow much more than 420 cfm, than what? You don't want to tie them to a cfm rating. If they respond to normal porting increases, then 10% is to be easily expected, and ~20% with a really good CNC program which would be super. If that happens, then they will become the EQUALIZER heads. Joe-JDC
