Quote:

CNC porting is a program designed for a specific head, the cnc program will get you the maximum allowed porting to achieve maximum flow numbers.



Not true. Why do you think Indy offers several different CNC versions of their heads? It's because not all CNC port profiles are created equal.

Quote:


a hand porter can not get each chamber exact giving you different results from head to head.
also theres a chance that a hand port job possibly could hit a exhaust port water jacket. ask me how i know. no more hand porters for me, its CNC or nothing.



A good hand porter is not going to break into the water jacket. There are 1000's of heads ported around the country by hand that don't break into the water jacket.

CNC is used because it's fast, easy, and repeatable. That means that CNC ports are set up to please the masses. A good hand porter can tailor the port to the motor...