Holley Choke - Vacuum connection?

Discussion in 'Engine Topic' started by EricsZ28, Aug 23, 2012.

  1. EricsZ28

    EricsZ28 Veteran Member Lifetime Gold Member

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    Where does the Vacuum line connect on a Holley choke? Should it connect to full-time (manifold) vacuum?

    If so, can I just "tee" off of the full-time vacuum line running to my mechanical advance on the distributor?

    Thanks!

    This choke:
    [​IMG]
     
  2. Damon

    Damon Veteran Member

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    Yes IF..... your carb and/or choke does not have provisions for an internal vacuum connection (between the back of the choke housing and the carb main body). If the carb came as an electric choke from the factory the passage is usually internal. If it's an add-on it's usually external. I'm guessing yours is an add-on.

    The vacuum source works the internal "choke break" vacuum piston that pops the choke open slightly upon initial cold start-up.
     
  3. EricsZ28

    EricsZ28 Veteran Member Lifetime Gold Member

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    Thanks, Damon. Yes, this used to be a manual-choke carb. The electric choke is an afterthought. The internal vacuum source is plugged.
     

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