High CFM heads - What would you chose?

PRH said
So, the numbers from the local bench on the 4.030 bore..... don’t break 300?
(Hard to see what the number actually is)

I’m assuming you know why the first set of numbers from the 4.125 bore stop at .650 on the intake port.

Do you know if it’s the same pair of ports that got tested on both benches?

That head just didn’t have enough volume. Floor tapers up, roof tapers down, and common (straight wall) tapers in. If those damn heads weren’t so porous and junk aluminum I would have liked playing with the one I had, and sold.