OMC Cobra to Mercruiser Conversion

Discussion in 'DIY Marinizing' started by mcattac, Dec 12, 2004.

  1. mcattac
    Joined: Dec 2004
    Posts: 2
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Buffalo, NY

    mcattac New Member

    With OMC out of the picture now, has anyone done this when it was time to rebuild/replace the motor and/or lower unit?

    I have a 1988 25' Sportcraft Fisherman with an OMC Cobra 5.8 liter.
    I was told the motor is a Ford 351 Cleveland.
    Has anyone swapped out this motor with a newer comparible Merc.
    Has there ever been a write-up on this.
    What about the transom? Especially the lower unit hole.
    Thanks.
    Mac
     
  2. gonzo
    Joined: Aug 2002
    Posts: 13,609
    Likes: 382, Points: 93, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    Is this one of the outdrives with the big round rubber gasket? The engine may be rebuildable, if not I can get you either a new or a rebuilt marine Ford.
     
  3. Scott_CVX20
    Joined: Jun 2005
    Posts: 2
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Toronto, ON

    Scott_CVX20 New Member

    Didn't Volvo-Penta buy the OMC I/O business?

    Why don't you see if you can get marine parts from them? Or try eBay or the internet. Assuming the drive is still good, it's be a lot simpler and cheaper than swapping it for a M/C. If you had one of the old OMC, VP or Merc drives (77ish or earlier) I might think about an upgrade.

    I/Os & Inboards have either Ford, Chevy, or Chrylser engines (Old VPs). for that stuff, just go to Jegs or Summit, or any parts dealer.

    Scott
     
  4. Dodgeman
    Joined: Jul 2005
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Kansas City, MO

    Dodgeman New Member

    OMC Cobra
    5.8L EFI is a 351 Ford. Like in a pickup.
    The Cobra unit is the OMC version of the Mercuser.
    I do not know if the lower unit componets will bolt up to the Mercuser stuff.
    I think that Volvo Penta parts will work with OMC Cobra as I beleve that Volvo
    bought the stern drive division of OMC from Bombardare.
     

  5. gonzo
    Joined: Aug 2002
    Posts: 13,609
    Likes: 382, Points: 93, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    There was a joint venture between Volvo and OMC for a short while. Those engines are available new or rebuilt. If the drive is good, that is the cheapest and simplest solution.
     
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.