4.3omc5.7 swap

Discussion in 'Powerboats' started by AUSTIN278, Aug 28, 2006.

  1. AUSTIN278
    Joined: Aug 2006
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: ILLINOIS

    AUSTIN278 New Member

    started convering 1989 omc cobra 4.3 over too 5.7 motor using car engine was wondering if anyone has done this or would have pos suggestions.any help would be appreciated
     
    AUSTIN278, Aug 28, 2006
    #1
  2. jimslade
    Joined: Aug 2005
    Posts: 304
    Likes: 3, Points: 0, Legacy Rep: 27
    Location: north Markham

    jimslade Senior Member

    I just finished converting a 3.0 to a 5.0. You have to modify the automotive engine to a marine application. The gaskets and camshaft and carb are very different than an automotive application. Also you have to use a marine ignition and a sealed starter and alternator. You are probably better to locate a marine 5.7 complete and fit it in . The mounting positions are different and the final drive ratio may need to be changed, or you will have to play with different props to find the right setup. Good Luck.
     
    jimslade, Aug 29, 2006
    #2
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