Best guess on 416 motor

dusterdoug said

258 @ .600"
This was with a 2.02 intake, a quickie bowl blend and our valve job, with no clay on the intake port entrance.

Remember too, many flow benches vary. It's not a flowbench "race", it's just data in my book to gauge improvements. Brian @ IMM sees 270 from his RHS @ .600 IIRC.

Click to expand...

Do you use anything on the intake flange to setup the air into the intake port? If not, you'll always be off on your flow #'s. The air sheers on the edges of the port making it very turbulent all the way through the port and past the valve.
If you don't like clay or whatever, you should at least attach the intake manifold and clay the carb flange and flow it that way. JMO!!
Brian