[RichSchmidt]

Hand porting is only as accurate when you measure every part of each port as you port them and get repeatable results based on a known head design.I dont care what anybody says,I have bee hand porting heads in my garage for years,and if you take a set of really well designed heads and plot them out on a computer and have a CNC machine duplicate what you enter,you will be hard pressed to get the same results with any level of repeatabitly working by hand.Hand finishing the CNC work is criical,but once you have a port design that works,I think the CNC machine is the best way to dulicate it.If you have a big shop and want t know how a head is going to respon to moving the port a set amount,it is much easier to do it by changing the design in the CNC program then tryng to guesstimate it by hand.

What I do today could best be descibed as hand finishing heads.Bowl blending,or widening the short turn,but a good set of CNC heads from a knowlagable maufacturer like AFR is leaps and bounds ahead of what most hand porters can do.Add hand finshing to the CNC head and you wont touch it by hand especially for the price