BBD reference page?

Slant 6 Engines

  1. dddDuster

    dddDuster Well-Known Member

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    I bought a BBD from a member here, now I want to put a kit in it. Tag says 8187s, I was trying to find a reference of what is was on so I can look at jet and meter rod sizes to see if close for my 198. Thanks!
     
  2. Bugman

    Bugman Well-Known Member

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    carb list.jpg
     
  3. Bugman

    Bugman Well-Known Member

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    Are you sure about that number show us a picture
     
  4. dddDuster

    dddDuster Well-Known Member

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    83985449-553D-4F12-B452-A481F3F199F5.jpeg
     
  5. dddDuster

    dddDuster Well-Known Member

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    Well crap, now I think it’s 8137s!
     
  6. Bugman

    Bugman Well-Known Member

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    8137.jpg
     
  7. Bugman

    Bugman Well-Known Member

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    Good number 3500 means sedan not station wagon
     
  8. slantsixdan

    slantsixdan =..=

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    No, 3500# means truck, not car.
     
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    • Bugman

      Bugman Well-Known Member

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    • Bugman

      Bugman Well-Known Member

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      Last edited: May 4, 2021 at 9:36 PM
    • slantsixdan

      slantsixdan =..=

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      Carburetor operation and repair manuals and links to training movies and carb repair/modification threads are posted here for free download.
       
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      • dddDuster

        dddDuster Well-Known Member

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        Ok, thanks all! I’m at 5200’, I’m thinking I need to maybe decrease jet size and perhaps use the higher altitude metering rods if they have them for this. When I did my Jeep’s YF, that’s what I needed to do to keep it from running pig rich. What say you all?
         
      • Bugman

        Bugman Well-Known Member

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        A little bit deeper into that carb number
         
        Last edited: May 4, 2021 at 10:07 PM
      • Dana67Dart

        Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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        I'm at 5100 feet and tried leaning out my bbd ( sea level car) ran like crap. Put original jets in and runs great.
         
      • Bugman

        Bugman Well-Known Member

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        Hope that's readable pages from a 1978 technical service bulletins carb update

        bull-2.jpeg
         
      • Bugman

        Bugman Well-Known Member

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        Stock jet size was .086 next size down would be .083 if need be. Custom metering Rod adjustment maybe a lighter step up Spring
         
      • Dana67Dart

        Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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        Is there any corralation between bbd jet number and size.

        310 vs 301 vs 294 etc
         
      • Bugman

        Bugman Well-Known Member

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      • Bugman

        Bugman Well-Known Member

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        In That linked post with The Carter sheets actual part number is 120-386 and next to that Is .086 120-383 would be .083. Edelbrock Jets will fit
         
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        • Bugman

          Bugman Well-Known Member

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          InkedScan_20160724 2_zpsyya9npwq_LI.jpg
           
        • Bugman

          Bugman Well-Known Member

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          by the dot
           
        • Dana67Dart

          Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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          BBD-4116SA (CAP, 273, automatic)

          Then that would make it:
          120-310S ( 0.010"?) Standard
          120-294S (0.094" ?) 1 step lean
          120-297S (0.097" ?) 2 step lean

          Doesn't make sense????

          Screenshot_20210504-233631.png
           
        • townsend

          townsend Member

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          1974 BBD carburetors and up used a simple correlation system between jet numbers and size,as shown in above post. The 1973 and older BBD carbs used a different system regarding jet numbers and size. Maybe Bugman can give a more thorough explanation.
           
        • Bugman

          Bugman Well-Known Member

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        • Bugman

          Bugman Well-Known Member

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          1974 and up bbd solid fuel design main metering system. 1973 and back air bled main metering system. Two completely different systems. Theory of operation and part style and numbering systems. In the solid fuel type carburetor circuit timing is affected by the actual level of fuel in the bowl. High fuel level main system activates early, low fuel level main system activates late. In Air bleed carburetors actual operating air fuel ratio is sensitive to the level of fuel in the bowl
           
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