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. 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.
isn't the CNC program obtained off of a hand ported port? they have to get them from somewhere
that is correct, lets just hope the head porter wasn't hitting the sauce or pipe when he was designing the program.
