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Thread: Ford 428 Cobra Jet Exhaust Backfire / Now 85 Pound compression - all 8 Cylinders
          
   
   

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  1. #1
    Bilt4ORDtuf is offline CHR Junior sMember Visit my Photo Gallery
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    Dec 2016
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    Proctorville
    Car Year, Make, Model: 1969 Mustang
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    Ford 428 Cobra Jet Exhaust Backfire / Now 85 Pound compression - all 8 Cylinders

     



    Due to a slipped Harmonic Balancer it backfired extremely hard. Trashed both mufflers. All valves operating, timing chain is chain is OK. Any idea what could cause the compression issue. Ran perfectly before. Stock engine.

  2. #2
    HOSS429's Avatar
    HOSS429 is offline CHR Member Visit my Photo Gallery
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    iv`e had balancers explode on my 351 with no adverse affects on anything else .. kinda odd you feel it killed your compression .. have you fixed it and ran it since ?
    iv`e used up all my sick days at work .. can i call in dead ?

  3. #3
    jerry clayton's Avatar
    jerry clayton is offline CHR Member Visit my Photo Gallery
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    Feb 2006
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    cam timing issue----------sheared crank key, Cam dowel pin(most likely) just plain put together wrong chain timing-----------

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