OMC to Berkley swap

Discussion in 'Jet Drives' started by tompete5kid, Jun 9, 2011.

  1. tompete5kid
    Joined: Jun 2011
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    Location: so. cal.

    tompete5kid New Member

    I just bought a 1974 Cobalt 18 ft. tri hull with a 307ci. chevy OMC enginewith a berkley pump,the last owner told me that it had originaly had a OMC jet.The same time I found this boat there was another one equipted the same,my question is was this a fairly common conversion and what kind of performance can I expect from it.I'm mainly going to be doing some recreational skiing and towing grand kids around on tubes.
     
  2. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    Are you sure it is a 307? That sounds like a Pontiac engine.
     
  3. whitepointer23

    whitepointer23 Previous Member

    307 is a chev. lots of them here were fitted to 1969 holden cars.
     
  4. tompete5kid
    Joined: Jun 2011
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    tompete5kid New Member

    Yes I'm sure it's a chevy.They put them in cars from about 68 through the early 70s and made the marine version for OMC rated for 210 to 245 HP depending on the year.
     
  5. CDK
    Joined: Aug 2007
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    CDK retired engineer

    As far as I know OMC never made a jet pump but put their name on a Berkeley for a short while, just like Mercruiser did in the past. Because of the poor performance compared to stern drives they quickly abandoned the idea and sold it under its own name again.
     
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  6. jim lee
    Joined: Feb 2007
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    jim lee Senior Member

    I -think- Mercruiser was a panther jet.

    Anyway, It should work fine for tubing with the kiddies etc.

    -jim lee
     
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  7. tompete5kid
    Joined: Jun 2011
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    Location: so. cal.

    tompete5kid New Member

    Thanks everybody, if it seems low on horse power for next season I'm looking at putting a small block 383 stroker in that I have left over from a stock car.
     
  8. jim lee
    Joined: Feb 2007
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    jim lee Senior Member

    If you need pump work in So Cal. Talk to Jack - Marine Performance designs
    949-631-2040

    Good luck!

    -jim lee
     

  9. tompete5kid
    Joined: Jun 2011
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    Location: so. cal.

    tompete5kid New Member

    I'll keep that in mind. I'm taking it to a local lake Thurs. morning first to see if it floats then if it does give it a short spin around the lake.
     
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