Don't get hyped up on flow numbers.
Port speed and efficiency is where the power is made.
Years ago, the boys at Reher & Morrison along with, at the time one of the great cylinder head guys Lee Shepherd, took CFM away from the head and the engine responded with more power.
Very true but if you look at what one guy's heads continously, make you have an idea which ones are bit inflated and which ones are more close to the performance. And I mean I would say that each head porter probally sets his bench up consistantly. But just my thought from reading and paying attention to you and others. Curtis do you use a 600 700 or superflow 1020? And do you use any pipe on the exhuast? Also anything on the intake side to create realistic no.s just curious?I'd say the same thing, look at cross sectional area etc,
these days with some of the castings we have available design has more
then over shadowed the callenge to get cfm.
Flow numbers are aslo hard to compare cause there's no standard
for flowbench claibration being use, ..
therefore 460cfm on one's bench could be 435 on another.