Quote:

---

CNC programs make full porting quick and affordable.They are only as good as the programs imput.AS said they are repeatable and accurate.If the imput information is based on the results of hours of hand work as well as accurate adjustments for thin ares or areas of structural integrety.Problems of core shift can be eliminated(scrap casting) if realy bad and a little hand work if not.The program should also be tailored to the build.Don't use a 280 when you need a 345.AS for the machine lines left,they can have a benifit to performance,like creating a reversion effect in a runner or a directional effect in a chamber on natural aspirated engines.On pressurized engines the smooth finished is desired.Most CNC programs can be run in a few hours and hand port can be 60 hours+-.Welcome to the age of techonolgy.

---

That is what I have been trying to say.Once you have the head port maximized and it is programmed,is any hand dressing needed??