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Well, perhaps just the opposite, ratio is computed, and pressure is measured after the fact (and varies with the condition of the rings and valves, for example...) I read your other posts about the damaged spark plug threads and the insert. I suspect your next step will be pulling the heads and...

OK, it might be best to post them as PSI as that is the convention for a compression test. That said, you should follow the steps described in the link I posted earlier, and these steps will help isolate whether it is rings or valves that are the problem. If I multiply out your 'ratios'...

Something is wrong here, a compression gauge gives reading in pressure, not ratio. Is there a PSI reading for this gauge, and if so, what were they reading in PSI. That will be more meaningful than a 3:1 or a 5.8:1 number since we don't know that those numbers relate to. That said, your numbers...

Compression ratio is basically mathematically based, not measured. It consists of the ratio of the volume of the cylinder with the piston fully down plus the volume of the head's pocket and the piston's pocket (which for a domed piston can be negative) to the same numbers with the piston fully...