Milling Heads Q
 

My heads are off right now and am getting new valvesprings today. So I figured what the heck...I'll have them milled. I have a .513/.529 cam, so can I mill them about .040 to bring the chambers down to 57 or so and bump compression to about 9.6-9.7? I want to go as much as I can but without having any P/V or intake sealing or port alignment problems. Thanks.