Mercury Mark 55A vs Mercury Mark 400

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  • June 17, 2015 at 3:37 am #1773
    mgsolakis
    Participant

      I have a choice of either a Mercury Mark 55A or a Mercury Mark 400 for my mahogany Paceship boat. Is one better than the other? What are the differences.

      Thanks

      June 17, 2015 at 12:38 pm #18263
      dave-bernard
      Participant

        US Member

        the 55A is 40 cubes and the 400 is 44 cubes. both a fine choice those 4’s were the best they made in my opinion.

        June 17, 2015 at 1:18 pm #18265
        John Schubert
        Participant

          Lifetime Member

          cubic inches means more power. The 44 has bigger carbs & reed valve opening. Go with the 44

          June 17, 2015 at 3:15 pm #18272
          chinewalker
          Participant

            US Member

            Actually, the 1959 Mark 55A is a 45 cube motor, too. The big difference is in the carbs – the 55A has smaller bore AJ series carbs, while the 400 has bigger KA series carbs. Plus, the crankcase is machined differently to accommodate the different carbs…

            June 23, 2015 at 1:44 am #18733
            mgsolakis
            Participant

              Thanks for the replies.

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