1989 4.3L - upgrade to 5.7 or newer 4.3L questions

Discussion in 'Gas Engines' started by pfouts, Dec 1, 2010.

  1. pfouts
    Joined: Dec 2010
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Minnesota

    pfouts New Member

    I have a 1989 Ebbtide Rivera with a 4.3L engine with a cracked block . I would prefer to upgrade to a 5.7L and if that is not possible, to upgrade to a newer 4.3L Vortec long block.
    I believe I have enough room for the 5.7L - however anyone know the difference in length of the block?
    Since the boat has fixed motor mounts, does the 5.7L block have mount locations anywhere near the 4.3L ?
    And if the 5.7L is not possible, anyone know of issues replacing a 89 4.3L with a newer vortec - that way I can have a smoother engine and there seem to be some upgrade options with 4bbl manifolds available for the vortec engines.

    Thanks for any suggestions,
  2. rasorinc
    Joined: Nov 2007
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    Location: OREGON

    rasorinc Senior Member

  3. gonzo
    Joined: Aug 2002
    Posts: 15,594
    Likes: 1,094, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    If you change the engine to a 5.7, you will have to re-gear the transmission too.
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