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
