Are you referring to cylinder compression, or cranking compression? Are you just trying to get a number to shot for while running a compression test, or are you trying to figure out cc's?
In either case, you need to give up more info. What's been done to the engine, how many miles, etc.
If you are running a compression test, make sure you know how to do it. If you forget some of the simple things, like having the engine hot, or blocking the throttle open, etc., the results will be all wrong, and will be meaningless.
Take care,
~Chris
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