I'll try real hard not to race flow benches here. If it helps, we have an Edelbrock RPM design, 330 cfm @ .600" and 350 cfm @ .700", produced from OOTB RPM flows of 287 cfm @ .600" lift. Our RPM heads on a 451 stroker have dyno'd 787 HP on 91 octane pump gas.
I'm pretty sure what I said was, on our bench, OOTB the RPM heads outflow the Victors to .500". I don't recall having "raced" the RPM heads against the Victors flow wise. Generally we'll design a head around the desired engine and cam characteristics.
Right now we are testing flow changes at various lifts vs horsepower curves on the dyno. Very interesting. First time we've had the opportunity to do so. Some beliefs are being substantiated and others are being revised.
