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Heritage wheels won't fit the SS.
They pulled the whole drivetrain so they could have a look at the whole drivetrain. These cars seem to run extra-rich(look at the exhaust and see how black they get).
There is something they told you that I believe may have not been really true. They said that this was the first time they'd ever had this happen to an LLT. If I were Chevrolet, and this was the first LLT that had this issue, why would they not box the whole thing up, take it back to wherever they're making these engines, and have some engineers find out why. I would want to know why.
What parts are being replaced? $4k is not much when you consider it's dealer prices. I'd definitely ask for a new crank, and if you get a new crank, I'd ask what the plan would be to ensure the motor would still be in balance.
Ask your mechanic friend about the scoring(it's hard to tell if it's scoring or if it's the way the block was machined.
Ask for the drivetrain warranty to be started from scratch, if not ask to talk to someone who can authorize it.
Good luck.
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