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    400-650 Mercury Thunderbolt information needed

    Alrighty then... I'll scratch 650's off the list due to weight. I take it the 402 is a 2 cylinder version .... hows that compare to the 400 4 cylinder ? More torque but not as smooth perhaps.
  2. X

    400-650 Mercury Thunderbolt information needed

    Howdy, I'm over in Houston area and looking for an old mercury thunderbolt 4 cylinder (or maybe 3 cylinder) to get restored for a future tunnel boat project. I'm getting a disparity in information surrounding some of these engines. First and foremost the engine will have to be in the lighter 4...
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