I am a poor country boy, and I can not afford CNC porting, but I do have a Harbor Freight die grinder, BUT one question I have asked and very few reply to is, WHO did the porting your CNC operations is duplicating? I have a homemade flow bench, and I can hand port most sets close to the CFM of a CNC head, but my heads have more velocity and seem to make a littler more power on the track and dyno. CNC stuff looks real pretty, but just to start a thread, how many people who are selling programs, tell who did the original work that is being copied?