4.3 mercury to 4.3 Vortec swap

Discussion in 'Gas Engines' started by Ben Chaput, Feb 17, 2020.

  1. Ben Chaput
    Joined: Feb 2020
    Posts: 1
    Likes: 0, Points: 1
    Location: Alaska

    Ben Chaput New Member

    Hello, I have an older 4.3 carb v6 mercury and I can't find the bolt pattern so I can't compare it to the newer blazer 4.3 Vortec if anyone knows anything I'd appreciate the help.
  2. Barry
    Joined: Mar 2002
    Posts: 1,830
    Likes: 474, Points: 83, Legacy Rep: 158

    Barry Senior Member

    I am assuming that you are referring to the bell housing interface?

    I would call Trans Dapt Adapters, They used to make adapters for various engine to tranny set ups. If they don't have it the should know
    Also a good bet is to call the auto wreckers, these guys normally know more than what one would think

    You did not really explain if it is matching an out-drive or transmission etc.
    The other thing to consider, even if if the bell housing pattern is the same is that
    you need to know if the spacing is the same from the back of the bell housing to the
    flywheel/starter ring
  3. 7228sedan
    Joined: Nov 2009
    Posts: 347
    Likes: 15, Points: 18, Legacy Rep: 60
    Location: New Jersey USA

    7228sedan Senior Member

    what year 4.3 are you removing?

  4. gonzo
    Joined: Aug 2002
    Posts: 16,778
    Likes: 1,703, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    If you are using an automotive engine, first check if it is internally or externally balanced. Externally balanced engines need a matched flywheel.
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