360 back firing bad

Discussion in 'Small Block Mopar Engine' started by Scott's dart, Sep 15, 2018.

  1. Scott's dart

    Scott's dart Well-Known Member

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    My 360 in my 75 dart backfires bad on the top end, it runs ok idleing and through mid range but when i stomp on it it back fires like crazy out the exhaust and sometimes out of the carb. The timing is set to 10° before. I took the carb apart and there was some junk at the bottom but after i cleaned it out it still does the same thing.
    23-Electronic.jpg
    This little gear in the distributor can move up and down like an inch, is that normal or is my distributor messed up?
     
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    • Jadaharabi

      Jadaharabi FABO Gold Member FABO Gold Member

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      Got a side picture of the bottom part of the distributor?
       
    • nm9stheham

      nm9stheham Well-Known Member

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      An INCH? LOL that certainly is not good. Some play is common in the upper part due to the mechanical advance but nothing like that.
       
    • MoparLeo

      MoparLeo NRA PATRON LEVEL LIFE MEMBER FABO Gold Member

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      Get a rebuilt at a parts house for cheap. It should help with spark scatter. Advance weights/springs could also be the problem. Checking with a good distributor can save you hours of guessing.