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  1. #1

    Default looking for engine help

    i just picked up an older bayliner the omc numbers says that it is a 1987 with a 5.0 4v motor . I know nothing about boat motors but have been told that it is a small block chevy. just curious if someone knows anything about these

  2. #2
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    5,196

    Default Re: looking for engine help

    Ayuh,.... Sounds like a 305, 4 bbl. carbed motor,.....

    Is the distributor in the front, or the back of the motor,..??
    Any Grease is Better,... Than No grease at All....

  3. #3

    Default Re: looking for engine help

    it is in the back. it says gm on the intake manifold. i looked up the OMC number and it says that it is discontinued and obsolete so i am just wondering if i can swap it out with maybe a 5.7
    Last edited by hulktruck911; 06-14-2017 at 09:36 AM.

  4. #4
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    6,807

    Default Re: looking for engine help

    the SBC v-8's (from te same generaton) usually interchange w/o any issues....

  5. #5

    Default Re: looking for engine help

    thank you. i didn't know if they were like regular motors as far as interchanging or not.

  6. #6
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    5,196

    Default Re: looking for engine help

    i looked up the OMC number and it says that it is discontinued and obsolete
    Ayuh,.... The long block motor is nothin' but a GM truck motor,....

    It's everything that's bolted to it, the OMC stuff that's obsolete, discontinued, objects of history,....
    Any Grease is Better,... Than No grease at All....

  7. #7

    Default Re: looking for engine help

    Ok thats good to know. I was told it either has a cracked block or a cracked head

  8. #8
    Join Date
    Sep 2008
    Location
    Hague, Virginia, USA
    Posts
    3,702

    Default Re: looking for engine help

    My experience is that the GM 350 will bolt right in to the same brackets as the GM 305. If you do end up changing out that engine, do yourself a big favor and first replace the oil pan with either an aluminum one or a stainless steel one. The standard pans will rust out over time, especially in saltwater. That's from personal experience.
    CHawk 25 DLX

  9. #9

    Default Re: looking for engine help

    thanks for the tip

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