Good points all around, and I agree that their domain is in the 500" range, much above that and a bigger motor is typically not gonna be upset by the much larger (B1 size) runners.
I'm impressed with thier flow/runner ratio, put another way a ~365cc B1 or INDY port would need to flow 360 @ .400 and ~470 at .650 to equal their efficiency.
They're perfect for what I'm planning to do (especially since I got them for a little more than 1/2 price) and not everybody wants a big hp high RPM motor with a relatively narrow powerband. I doubt a B1(even if it were legal) would have won the Engine masters 2500-6500 highest average TQ/HP contest, at least not without a lot of epoxy. When you start to realize that within 5 or so years I think DFI is going to become the new dominant method of fuel delivery, port efficiency and smaller cross section (at least partly because the mass/volume of the fuel doesn't need to occupy any runner space in the manifold), I think the trend will continue to be toward "faster" flowing runners.
