These builds are commonplace in the Corvette & Camaro communities, who share the LT4 platform with the 5BW. In short order, as more and more show up on the used marketplace and warranties expire, we'll see many more here.
There's a good chance that they aren't actually warped. There very well could be pad deposits on the rotor. Check the manual for burnishing instructions and see if that doesn't solve the problem.
You need to get a (the) part number(s) of what they replaced. The LT4 is not just any old 6.2. Seems doubtful that they'd have an LT4 just sitting there.
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