Originally Posted By fast68plymouth
If I'm selling new Indy heads, and the customer is looking for something that's "fully ported", I just get them CNC'd from Indy, then I do my valve job and prep.

On my bench, after the VJ and prep, a 440-1 CNC 325 flows 360-365.
A CNC 345 goes 380-385.


How do these numbers compare to a hand port job? Just wondering if CNC is set for a conservative number as opposed to having someone hand port and get a visual of the actual ports before and after.