Check out these flow #'s!!!! Tell me what you think!!!
#21
Big E, that flow sheet looks typical of a head that flows well up through the curve, but gets turbulent up at high lift. 341 is certainly attainable, and if the shop has a good reputation I'd try them. I would like to have seen what the intake port flow was at .650". It may have still been smooth there. I don't think the 341 was inserted there as you have been told. As a matter of fact it would be my bet that they are being honest by showing that the head got turbulent and backed up after .600" lift. It's real common for a factory LS head to go turbulent past .600" lift. You can smooth them out, but you get dangerously close to water doing it.
Just my two cents.
Just my two cents.