Bottom end bog

Discussion in 'Troubleshooting & Diagnosis' started by Bryce Maese, Oct 5, 2021.

  1. Bryce Maese

    Bryce Maese New Member

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    Hey everybody,
    I just finished rebuilding my stock 350 with a new intake, Holley 680 brawler, msd distributor and digital 6al, it runs great and is scary fast but at the very bottom end on low speed acceleration at almost exactly 1000 rpm the car bogs and then breaks out of it by 1300-1400 rpm, I have tried adjusting the primary fuel pump arm, float level, timing, vacuum advance, any ideas
    Thanks
     
  2. carhead22000

    carhead22000 oldblue

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    does that primary pump shot have a diaphragm. Check it.start there.
     
  3. Bryce Maese

    Bryce Maese New Member

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    Well I haven’t looked at it but the carburetor is brand new so could this still be a problem
     
  4. carhead22000

    carhead22000 oldblue

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    did you get a backfire at any time at all.if so its a place to start.try a carb spacer.i,m sure more guys with more experience will chime in.
     
  5. MChamp

    MChamp Veteran Member

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    Power valve not sized correctly. At the proper vacuum I should say. There's a guy on here that's a freekin carb guru. I'll look
     
  6. Bryce Maese

    Bryce Maese New Member

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    Any luck finding said carb guru
     
  7. MChamp

    MChamp Veteran Member

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    Not yet, I've looked through all my posts but can't find the thread. I'll keep digging around but I still lean to a lighter power valve.
     
  8. Bryce Maese

    Bryce Maese New Member

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    Alright thanks
     
  9. Bryce Maese

    Bryce Maese New Member

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    upload_2021-10-8_19-31-29.jpeg
    if those are the current specs what would you think as a replacement
     
  10. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

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    Let's start off with the most common one: Have you checked for a vacuum leak?
     

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