The other component of the lemon law class action suit against GM dealt with the 2011-2014 5.3 LS Vortec piston ring material and design.Blair
There is a law suit on this and if i was you i would be checking it out.
The issue first appeared, intermittently, in 2007.
The court found in favor of the class plaintiffs in the amount of ~$103M...
allowing each class participant about $2200 each. Hardly enough to repair the existing engine let alone installing a new short block.
Ford and Chrysler are experiencing even greater law suit woes... pretty much leaving Toyota as the safest bet.