6.0 Block
Looks like the boring bar insert-cutter came loose and gorged into the cylinder wall.
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It's SMOKED. Your machinist owes you another. Sure, they "could" sleeve it; OTOH with non-runnable butt rebuildable LQ4 cores (that's what that looks like... iron 6.0) a dime a dozen, that would be a $500 solution to a $50 problem.
I call BS.
Which should be the machine shop......... PRONOUNS!
That block could be made out of jelly; there's still NO WAY that a tool could get loose and move THAT MUCH all on its own.
Basically they didn't have their boring bar tightened down properly, or something about it broke just at that point in the process.
They owe you an equal block core, and to finish on it whatever they've already charged you for. I'd hate to pull the "you'll hear from my lawyer" threat butt that's where this one is at.










