I had the exact same experience. It went from a rather innocuous light tap to new lifters and cam. Several thousand bucks just to get it back to stock performance. Oh, the mods that could have bought!
Similar experience. Slight tapping just before turning off to run into a 7-11. When I returned - vehicle would crank but not start. Long story short - somehow a piston had "let go". Maybe during the attempts to restart. GM was at a loss to explain how this could happen at only 107 K miles. So much so - that they paid for 1/2 of the engine replacement bill.
Since the engine and supercharger were being replaced - I had them replace the water pump, engine mounts, transmission mounts, plugs and wires, belts and the front electromagnetic shocks, upper control arms, radiator etc. What the heck - if you are replacing the engine - might as well replace a few other parts at the same time.
New Engine came with 100 K 36 month GM Performance Parts warranty. I have only put 17 K miles on the engine. I have taken a liking to electric vehicles (not Tesla) and don't drive the V much anymore. Time to sell it while it is still under warranty!