I would some how find a compression gauge to use. Figure your cost of rings, piston gaskets and time involved. If your guess is correct your in good shape but if not you have wasted all that time and parts. Look on the internet for a gauge with the rubber tip, you just press it in the plug hole and crank the engine, this type will work on any engine. I got mine @ Auto Zone for 30 some dollars. You can also check harbor freight.
TOM
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