Compression test
#1
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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
Dry test
1-160 2-210
3-212 4-170
5-212 6-175
7-200 8-150
#2
CF Monarch
![Default](/forum/images/icons/icon1.gif)
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
Dry test
1-160 2-210
3-212 4-170
5-212 6-175
7-200 8-150
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