350 backfires

Discussion in 'Small Block Tech' started by al gray, Feb 18, 2018.

  1. al gray

    al gray New Member

    my 70 skylark 350 runs great....only problem is , usually before the engine is fully warmed up, when i put the pedal to the metal, the engine makes a loud pop and there is a temporary lose of power.... any ideas ?? thanks
     
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    It’s going lean. Is it a Q-jet?
     
  3. sean Buick 76

    sean Buick 76 Buick Nut

    Make sure it’s warmed up FULLY before you stomp it
     
    MrSony likes this.
  4. al gray

    al gray New Member

    hi .....yes its a edelbrock 4 barrell....600 CFM i think.....thanks
     
  5. Fox's Den

    Fox's Den 355Xrs

    If you have that Edel on a stock intake you might as well forget it and throw it in the trash. Those square bore type carbs (all 4 holes the same), DO NOT work with a stock intake, the adapter screws up the whole system. YOU MUST have a Q-Jet with a stock intake or get yourself a 650 cfm Holley double pumper spread bore and that will work, but will need to be tuned correctly. This is for stock intake only.

    If you have a TA intake the Edel will work with tuning but I think still is fair at best. I gained 30 Hp on the dyno using a 750 cfm Holley double pumper square bore with the TA intake. As compared to using the Carter AFB 750 cfm basically same as Edelbrock but I think the AFB is the better carb .

    If you don't know how to mess with any of this then I would get a Q-jet and let one of the guys here that rebuild them, they do a great job with those carbs and the car will run right, they probably have one on the shelf for stock engines if you cannot provide one.
     
    alec296 and 300sbb_overkill like this.
  6. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    Typically the Edelbrock carbs will run rich at idle and cruise and will be leaner @ WOT when you want more fuel.

    If you're going to try to use one, get an O2 gauge of some sort to help you tune it. Those rods, springs and jets in the Edelbrock carb are a PITA! GL
     
    alec296 likes this.
  7. alec296

    alec296 i need another buick

    I would blame carb for being lean also. Contact Quadrajet Power for a performance Quadrajet.
     
  8. al gray

    al gray New Member

    a big thanks to all you guys for your input ......al
     

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