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    1968 100hp merc 1974 115hp merc

    are these two lower units interchangeable?<br />also are the pistons and rings interchangeable?<br />i know that the serial numbers don't match <br />because as the newer models came out the serial numbers started to change.<br />can anyone with older merc experience give me some helpful...
  2. C

    1974 115HP MERCURY

    is the electrical wiring harness on a 1974 merc 115 ob the same as a 1968 merc 100 ob harness, and are the lower units and props interchangeable
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