I deck them .040-.045 routinely and never have any problems. I have taken some OEM blocks .100.......one even .120 once. No problems. I do think a block with a bunch milled off the deck is not a good candidate for having a sleeve in the future. I cut a junk block up years ago just to look at the core up around the deck. The cylinders are tapered out near the deck. If the deck is milled a bunch, and the cylinder got bored for a sleeve, it would start getting thin where the core turns the corner up top. You would have no issues at 10.110 other than the fact that you will have some creative fit-up on the heads and manifold. Angle milling the heads about a degree will help that. Then the valve covers will still fit the bolt holes. You can correct for a one degree angle mill and .050 off the deck by changing the angle on the manifold only. I don't try to cut the cylinder head face. The water holes in the deck get too close to the flange for my liking. One degree of angle is about .094 to nothing on the head. I just go about .080 if I do it, generally. If you measure the width of the head..........divide your angle mill by the width of the head, then multiply by the height of the intake flange, you can calculate the amount of the angle mill for the intake...............and also measure it to confirm the number.
