OMC 4.3 to 5.0 swap?

Discussion in 'Gas Engines' started by tdno11, Apr 15, 2015.

  1. tdno11
    Joined: Apr 2015
    Posts: 2
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: United States

    tdno11 New Member

    Hi, I was thinking about swapping my 1987 4.3 OMC to a 1989 5.0 OMC. I read everywhere that the outboard drive should match up but my question is regarding the motor mount position. Are they identical or is the 5.0 motor mount location slightly different? My 4.3 is shot and I am getting a good deal on this 5.0 and want to know what I'm getting myself into lol.

    Any info would be great, thanks.
  2. gonzo
    Joined: Aug 2002
    Posts: 16,353
    Likes: 1,405, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    No, the mounts are in a different location. The 4.3 is a shorter block. You should also measure that there is enough length for the new engine to fit. The gearing in the 4.3 is 1.65 instead of 1.50. You could install a higher pitch propeller, but it won't be as efficient as the proper gearing.
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.