[KingLT1]

The LT1,L83,L86 all seem to have a better track record than the revised L84 and L87 from 2019+. I don't know why exactly but the revised engines are having a lot more problems. If you want my honest opinion, I think it's from running shit 87 octane fuel and the engine knocking all the time. Even though they say you can run 87 octane it's absolute piss water for these high DCR engines. I recently seen GPI post that they have had stock trucks come in for mods and the ground straps are missing from the plugs on some cylinders.

Pro tip- If you want to run a cheaper fuel, look for the blue handle E15 88 octane. You wouldn't believe how much more knock resistant that blend is over E10 87. Any NA engine I have tried it in (Specifically the LGX 3.6 and the 5.3 in my Yukon) will knock on 87 but run full commanded timing with no knock on E15.