This picture is a perfect example of why you can not just compare port volumes .

Case in point look at the port opening verses the deck height.


pred vs b1


pred vs eddy



I will take angle of entry more so than just simple port volume that why the pred kills the B1 stuff and why the b1 beats the 440-1 stuff.

Having a big volume doesn't matter as much if you have to run uphill and then dump into the chamber.