Did you miss the part where I said low lift, low RPM tow rig? The thread is on speed talk. It might be 8-10 pages back but it's there.
I learn. All the time. And I learned I don't love flow numbers and I don't fall in love with low lift numbers.
I will say this. Junk heads make junk power. Usually flow has little to do with it. You can have 300 CFM and have a dong beater, and you can have 330 CFM out of the same casting and it's a pig. And, let's say the 330 CFM has a smaller cross section.
Horsepower is horsepower. Flow is flow. The two aren't in each other's hip pockets. More than once I've lost flow across the board and made more power. That's because flowing a head is an I exact science.
I'm going to start charging for this info.