I agree but i think what is trying to be said....or maybe i should just say. I .
I have made this statement many time but i will post it up again......wish i could remember the porters name.......The one that sells Pipe Max software......
any how, he ported two different sets of heads both had the same cross sectional area, both flowed the same CFM and there was a 100 HP difference. Between the two heads.
Two head with the same cfm, But are not even in the same ballpark.
keep that in mind when they say numbers are not that important.
They are! but you can chase yourself down that big cfm rat hole path if you are only thinking cfm.
EDIT let me clarify both set of head were identical in every way before porting then. I made it sound like to different style or brands. no identical heads.