Started with #6 misfire…

It won't be long before you have a noise from the cam being damaged. Those camshafts in the LT based engines are very soft. Unfortunately when you look at the cam lobe from The lifter side it will play tricks on your eyes. It will look like it's in better shape than it is. I'd rather see you do a full delete and skip out on having the heads machined then to just replace the bad lifter and hope that it holds up for a little while. See my last comment I just left before this one. Due to my delayed response I'm replying to both your comments now.