GM certified technician here. If you are curious, here is a quick snippet from the service manual for performing a compression test on either a 5.3 or 6.2 direct injected engine. Just using this as an example, most GM engines are the same although some specs may be slightly different for supercharged engines or something like that. Use this as a good rule of thumb. In my personal opinion those numbers look perfectly fine and raise no concerns in my mind.

"Compare the compression readings from the tested cylinders.

- The lowest reading should not be less than 80 percent of the highest reading.
- No cylinder reading should be less than 862 kPa (125 PSI)."

Could you explain a bit more - what makes it look good? Thank you! 

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Looks good especially for 900 hrs. None of the values were zero, ha !

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