intake milling

I believe it's for every .010 off the deck it's .0095" off the intake flange. I just use 1:1. If the holes in the head are visible in the intake holes but not centered which way are they biased towards? If the holes in the head are not 100% visible you might as well just cut the intake because it's going to take more than .030 per side to fix. To properly align the ports and seal you should have the head bolt hole in the head visible off center and biased towards the top of the intake hole with no gasket. I use the Ultra Seal Mr Gasket pcs and that is about .045" thick. If you are using gaskets that are .072" thick you will need to mill more to make them fit properly.