Yes but i thought a raised port head would have flowed better all round not just in the higher lifts. Does the P51 have a greater cross sectional area but tighter short turn so as the volume of air flow increases it has trouble getting around the turn and the A460 have a smaller cross sectional area but better short turn which helps the higher lift numbers.What are the features that make one better in the mid lifts and one better in the higher lifts? I Am just trying to understand the design features that make each head better in its particular area.In my oppinion, those heads weren't designed to use similar valve lifts at similar RPM levels. So, of course they have different shaped flow curves.
Apples vs. Oranges again...!