Quote:
Originally Posted by Asahi123
I have 71 Chevy 350/350. I did a compression test I got 120 on all the clynder. So is that good or bad? Mileage is 147,000.
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It depends. Shooting from the hip, I'd say it's low but reasonable for those miles. However, did you have the throttle plates propped open when you did this? If not, it may read low or uneven depending on your technique. And what is the goal here? To diagnose a problem (ie: cylinder not firing, excessive blow-by, leakdown) or what? Usually it is more important to note that the compression doesn't vary more than 10% amongst cylinders, and in that case the details don't matter as much. But if you are trying to figure out something more complicated, then the details of how you did the test do matter.