Possibly could have it sonic checked to test thickness. Commonly done on the bores of race engines to know exactly how far to bore. Should work the same for casting thickness. I sure wouldn't go to all the trouble to build a 53 block on a hope and a prayer it doesn't crack. The problem with those blocks is they are fine, right up till they aren't. I've seen low mile crack, I've seen high miles crack. one thing I can say, never seen a Duramax crack😀.
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