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    Mercruzier 3.7 half block bad cylinder

    I have a 1988 seafarer with a merc half block 3.7 ..3 of the cylinders have 170lb pressure 154 lbs 150lbs but one has 65 lbs. Is it worth running till it dies or is it worth putting new rings ? Don't have tons of money to sink in and very little knowledge with I/O and the costs involved. Also...