After we strip the block bare, we cart it over to Specialized Motor Service (SMS), where Jerry Goodale makes a precision measurement of the bores. Most are at .005-inch wear, with the worst being #8 with almost .008 inch. We want to try for a .040 inch over block, both for the thicker cylinder walls and to save at least one further overbore to the next size up of +.060 inch, the biggest practical overbore on a 340. Since the block is already at .030 over, taking it to +.040 means removing only .005 inch of material from each side of the bore at the unworn portion at the bottom of the bore, and having just over .001 of material thickness to work with at the most worn part of the cylinder at the top. "It's going to be close." Jerry said; "Load it in the CK-10 hone and we'll see if it'll clean up."