Thanks for clearing that up Mike!!
Sounds like you're saying it probably doesn't take much, if any, more time to CNC an iron head over an aluminum head.
That's my best guess. I'm not not sure how many tons of metal we have cut with out CNCs, hundreds I would guess. I haven't done any full CNC head porting, but it's similar enough to other 3D surfacing like molds and stuff that I think my estimate is probably correct.
One think I know for certain is I hate machining cast iron, it makes a nasty mess, it's a lot like dirt or mud when you do a lot of it and the coolant washes it around in the machines. If you cut it dry then its like dusty dirt.
