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should mention that a thicker headgasket will lower compression (pressure) due to an increase in volume. numbers dont mean much on their own, its the consistancy between cylinders thats important and how the engine runs. (does it burn oil etc) another question to ask is how recent the rebuild was; has the engine been properly broken in?
combine the weak battery with a lower compression ratio from the thicker headgasket, im willing to bet that the engine compression numbers are good, but compression numbers only tell part of the story when determiniing if an engine is in good condition.
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