I have flowed many cnc ported heads. AFR heads seem to be right on the money with my bench. All others have fell short. As cast heads usually flow really close to advertised though. It seems to me that the superflow 1200 puts out higher numbers. Maybe it is actually more accurate though and my bench is just reading low compared to big box stores with mack daddy flow benches.

I really dont know what you guys mean by hand finishing a CNC port. I usually find no difference in flow sand rolling a port so mine are left like Brads picture above.

Btw, nice work Brad