When this kind of thing happen, I would try to make the Ferrea valve work more like the other valve in a sense. I suspect the valve job is what's doing this.
Bowl %, throat, valve job (either biased or not), and chamber transition play a huge role in getting a fast port to play nice on a flow bench. From what I've seen on sb mopars, there is a point you don't want to go over on air speed...and it's higher than I use for other heads. And it seems to work. But once you go over that fps speed, power will suffer! So be careful!! I don't like the .100 and .200 flow numbers on the Liberty valve FWIW....Totally agree, Imagine what the flow rates are backwards.
