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Thread: 650 speed demon help

  1. #1

    650 speed demon help

    Have a 355 chevy with a edelbrock performer package in it and vortec heads. I put on a 650 speed demon and the car has a bog when you hit the throttle for a second or 2 before it takes off. It is a vacume secondary carb should i go with a stiffer spring to slow down the secondaries.

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Dec 2008
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    Sugar Hill, GA
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    1,365
    Several possibilties:
    Weak secondary spring
    Timing
    Acc pump linkage out of adjustment
    Bad check (the diaphragm thingy) for the main acc pump.

    Good luck!!

  3. #3
    I had the same problem with my 650 holley carburetor, it was a matter of getting the jets right and the cam pump on the side of the carburetor adjusted right. Finally after many tries I finally got it right.

  4. #4
    Senior Member RACING JUNKIE
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    Jun 2003
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    Hobbs, NM
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    842

    Re: 650 speed demon help

    Quote Originally Posted by purplemonte
    Have a 355 chevy with a edelbrock performer package in it and vortec heads. I put on a 650 speed demon and the car has a bog when you hit the throttle for a second or 2 before it takes off. It is a vacume secondary carb should i go with a stiffer spring to slow down the secondaries.
    Nope. Secondaries aren't even opening yet, when your first hitting the throttle. Try a bigger squirter and check for any vacuum leaks.

  5. #5
    Senior Member MASTER BUILDER
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    Oct 2007
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    Staunton,VA.
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    650 demon help

    I agree w/ dparker. Sounds like a similar situation we were having w/ the monte that I was telling you about. Except the factory distributor was the problem so he bought a new HEI dist. hooked up the vacuum advance and that cured it. Since he drives it everyday this was a good choice for his pocketbook. Kris

  6. #6
    Senior Member MASTER BUILDER
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    Oct 2007
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    Staunton,VA.
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    650 demon help

    Did you get youre carb straight??? Kris

  7. #7
    Senior Member MASTER BUILDER
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    Oct 2007
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    Staunton,VA.
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    249

    650 demon help

    I guess he fixed it.

    Kris

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