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not going against anybodys machine work, just a question.could the cracking be caused by boring honing cylinders to tight for pistons?

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These are the kind of questions I have too. The engine plate suggestion above could be question mark. Every big block race car I ever had used a motor plate. Why do some shops see more problems than others? I have seen some awful crappy machine work performed over the years and I know 2 shops locally that I wouldn't let them change the spark plug in my lawnmower.
If you guys are gonna scrap those THIN blocks I will take them off your hands to free up some room for you in your shop.