1957 Sea Kings block swap

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  • June 22, 2016 at 12:45 pm #4564
    mercuryman
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      I have a good 1957 12 HP Sea King with bad rod bearing and scored crank . Can I swap the block with 1955-56 Evinrude-Johnson 15 hp block. From looking at pictures it looks about the same. If I put the Sea King head and reed valve cover on 15 hp block I could install gas tank and side cowls. Is this possible.

      June 22, 2016 at 6:26 pm #38772
      frankr
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        While they share the similar blocks, they are different inside. The 15 E/J has roller bearing rods and is a larger bore. If you are considering swapping the complete powerhead, I think that will work. But because of different bore, the heads are different. Are you saying the E/J head doesn’t have the cowl brackets? I thought it did. But certainly could be wrong.

        June 22, 2016 at 8:38 pm #38780
        mercuryman
        Participant

          Frank the E/J have cowl brackets but they are different than the sea king. The sea king has a screw thread on head for cowl and E/J have a rubber grommet.

          June 22, 2016 at 11:02 pm #38787
          frankr
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            Hmmm. Your Sea King must be the "Standard" model then??. Yep, re-reading it I see you said it has an integral gas tank. I guess it is a moot question anyway because of the different bore.

            June 22, 2016 at 11:33 pm #38790
            mr-asa
            Participant

              Frank, I think he’s talking about swapping the entire powerhead. How I’m reading it, at least.

              I’ve thought about doing it myself on my 12D10

              June 23, 2016 at 12:35 am #38795
              frankr
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                quote Mr. Asa:

                Frank, I think he’s talking about swapping the entire powerhead. How I’m reading it, at least.

                I’ve thought about doing it myself on my 12D10

                Yes, that’s the way I read it too. But there is the problem with putting the Sea King tank and cowls on the J/E powerhead. At least that is what I’m getting. We didn’t even get to the J/E powerhead might not fit the "Standard" Sea King exhaust housing. I suppose you know the "Standard" is the old pre-’55 stuff, compared to the 1957 "Deluxe" models with up to date lowers.

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