dagger1982

GM 5.3 Liter V8 Vortec LC9 Engine in a 2012 Suburban. Lifter collapsed so a friend mechanic rebuilt the top half. Used a grinding/lapping compound to refresh the valve seats. Having misfires (4 and 7) so I asked him what the compression test results were. I think they are a bit wonky but would like opinions before I say anything. 164k miles
Dry test
1-160 2-210
3-212 4-170
5-212 6-175
7-200 8-150

oilcanhenry

Ideally you don't want more the 15 percent difference between cylinders, but you've got well over that with #1 and #8 vs the others. Could just be the piston rings. I'd see what a wet compression test says.