I did a compression test (my first time) on an SBC 350 in a 1977 Corvette.
Posted are the results. To each corresponding cylinder number, the first value being dry test and the second value after squirting a bit of oil inside the sparkplug hole. Then a description of what the sparkplug looked like.
- 150 150 clean sparkplug
- 150 145 clean sparkplug
- 140 150 sludge on sparkplug
- 150 150 mostly clean sparkplug
- 150 155 clean sparkplug
- 145 150 clean sparkplug
- 155 155 clean sparkplug
- 140 140 clean sparkplug
I noticed I was burning oil and I figured I should do the compression test. I wanted get a good idea on the condition of the engine.
What do these results tell you? Not having done a compression test before I’m not too familiar about what these results maybe telling me.