Like Ken said, these engines are tough. 60mph in 4th gear is only about 2700rpms. Hell, I wind mine up to 60 in 2nd gear fairly often, and that's still just shy of hitting the rev limiter. The only somewhat-common issue I'm aware of with LS2s is that some consume oil much quicker than others. Maybe your son's car had this problem and it was running itself dry. Whatever the case he should get a new motor under warranty.
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