booster vaccum ?

Discussion in 'Small Block Mopar Engine' started by Gator77, May 12, 2018.

  1. Gator77

    Gator77 Well-Known Member

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    where should you run booster vaccum ? ported on intake or back of carb.340 street demon carb 750 .484 cam. 2800 stall converters.sometimes it wont idle in gear
     
  2. nm9stheham

    nm9stheham Well-Known Member

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    Not sure I follow... ported vacuum is not on the intake. Brake booster vacuum connects on the intake manifold, under the carb.

    Is the 'not idling' problem happening when you hookup the booster?
     
  3. Gator77

    Gator77 Well-Known Member

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    so i should run vaccum on port on back of carb.i will plug off booster and see what happens.
     
  4. 67Dart273

    67Dart273 Well-Known Member

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    Does not matter. Traditionally they were connected to a vacuum T on the rear runner of the intake

    The carb port is normally for PCV
     
  5. RustyRatRod

    RustyRatRod Just another dumbass. FABO Gold Member Technical Editor

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    Yup. like Del said. Intake for booster and carburetor for PCV.
     
  6. Gator77

    Gator77 Well-Known Member

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    ok tryin to get this motor tuned .what else can i look at for idling in gear.i have 12-13 in of vaccum at idle in park.idle set at 900 -1000.timing is at 10btc.
     
  7. 1969383S

    1969383S FABO Gold Member FABO Gold Member

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    Big cam?

    If not you have leakage somewhere to include the booster as suspect.
     
  8. 67Dart273

    67Dart273 Well-Known Member

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    No, "big cam" NOT NEARLY ENOUGH initial timing. You may need to recurve the distributor. You likely want more like 15 initial OR MORE
     
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    • Gator77

      Gator77 Well-Known Member

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      i found problem im running a street demon 750 i found a adjustment under the electric choke .theres 2 slots rite under air fuel mixture screws i needed to close the throttle plates some more.thanks for your help guys.smoken tires and melten asphalt now
       
    • nm9stheham

      nm9stheham Well-Known Member

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      Good for you! That is an adjustment a lot of guys miss.
       
    • famous bob

      famous bob mopar misfit

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      intake. make sure ur check valve is good.