[Bill Diehl]

When the lift is only 2,3 4 or .500 flow is everything...its the _"venturi" effect that speeds up the velocity...when the lift gets to be 7,8 .900 and above the focus is on the velocity and cross section, not flow because the valve lift outpaces the port...in other words it's all relative and stockers are not supposed to alter the ports so the valve job is everything it's the only way to get an increase of anything...legally...my Cleveland heads that I no longer own, they moved 328 at .500 and 349 at .550 and they were legal heads , I taught the owner that owns them now how to do it and he achieved the same results...they fell off like a rock above 600 by design