intake milling

For every .0048 off the head or block you need to mill .0095 from the intake per side, or intake side of the heads. This doesn't matter if the heads have been milled before or not, a 'cc' is a 'cc'.

FIXED
Now you are right...

and I'll add that 273-318 take .0053 for every ccc and .0095 for every .0053 removed..