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Lv 6
? asked in Cars & TransportationMaintenance & Repairs · 5 years ago

Average intake manifold vacuum on a 1977 Dodge BB 400 D-150 2-barrel Holley.?

Just bought a vacuum gauge for my truck but can't find out anywhere on what the vacuum psi should be. Auto Zone nor the rest know either. Googled for the last 2 hours and still no answers.

3 Answers

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  • Ron
    Lv 7
    5 years ago
    Favorite Answer

    http://www.mopar1.us/engine2.html

    check the "idling by"

  • ?
    Lv 7
    5 years ago

    18 inches give or take 2 and steady is what you are looking for at idle.

  • thebax2006
    Lv 7
    5 years ago

    Most motors have 19" hg. at idle rpm.

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