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Dual Quads in Reverse?

Discussion in 'Engine and Drivetrain/Mechanical' started by Horseplay, Feb 1, 2018.

  1. Horseplay

    Horseplay I Don't Care. Do you?

    Why are dual quad carbs mounted "backward" (primaries to the rear) on BB Ford engines? I have a couple ideas but having never owned one don't really know for sure. I'm hoping someone here knows the reasoning.

    I'm guessing either linkage or fuel supply related but that's just off the top of my head guessing.

    Anyone KNOW?
  2. BobV

    BobV Well-Known Member

    The FE 2x4V used a progressive mechanical linkage on the passenger side.
    You wanted the primary barrels closest to the intake center to be the "light throttle" barrels for best fuel distribution in part-throttle driving, so the front carb was the primary when the setup is reversed. Most conventional 2x4V setups made the rear carb primary.

    Now, why did Ford do the mechanical linkage on the passenger side? Probably so they could use the same linkage parts for the tri-power and the 2x4V setup. The carbs on the tri-power HAD to be mounted backwards for distributor clearance.
    tarafied1 likes this.
  3. Horseplay

    Horseplay I Don't Care. Do you?

    Thanks, Bob.
  4. c6fastback

    c6fastback Member

    IMG_1217.JPG IMG_1216.JPG
    Here you can see why the distributor clearance is needed , too tight if the fuel bowl in the front .

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