Speedmaster, Edelbrock, ProMax head question for you guys

It’s the same port, just tested with two different valves?

I’d have to check my notes, but I think I did that same test on some ported X heads, with the opposite results.

Edit- Found my notes…….
The Liberty valve was better than a Ferrea 6000 thru .450 lift.
After .450 and up the Ferrea was better.
The difference between the two on this head was nowhere near as much what you’re seeing.

Peak differences:
Liberty up by [email protected]
Ferrea up by [email protected]