unless you want some specifically for YOUR engine,custom work from someone who KNOWS what they are doing,not a machine that religiously follows what is input to it.it might be EXACTLY the same,but if its not input correctly in the first place then it will all be EXACTLY wrong!
and youre also saying a CNC machine never does anything wrong?hmmm.....well the scrap metal bins outside metal workshops around the country will disagree with you.