Here is the most awesome site I have found for a compilation of head flow numbers, by Stan Weiss. I dont know him but must be a very helpful fellow to post this for everyone!!!


http://users.erols.com/srweiss/tablehdc.htm

Some of the Weiss numbers are "ported" - maybe without saying so -

I think the 390's, unported, flow about 220cfm intake at .500 and 28", and the exhaust about 135.

The Edelbrocks are about like 427 Medium Risers at about 265 intake and 185 exhaust.

Cobra Jets (I think) are about halfway between these two.

Sad thing is, a lot of Chevy and Ford SMALL block heads outflow any of these today. But help is on the way, the FE is getting popular again.