The new LT-1 based valve trains do that, I have a 14 Silverado with the 6.2 and it has been doing that from day one. 25K now and it pulls to fuel cut-off 6250rpm all day no worries.
In fact we have had to custom program my trans to shift cause the engine does pull to fuel cut-off.
The car has a plenty enough warranty in case you got a misassembled engine.
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