Re: Shop is milling my heads .030" about how much more compression should that> (dizwiz24)
Wellllll, You need to find out the "cc" of your heads after milling; the most accurate way is to seal a piece of hard plastic over the cyl. area and measure water into it thru a small hole that you drill in the plastic. Then you need to know the "cc" of the pistons, even if they are flat tops they will have notches for valves. Also need to know the thickness of the head gasket and how far below the deck the top of the piston sits at tdc. Then you can take all the numbers and do the math. Easiest way is with compression ratio calculator software-just plug in the #'s.