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79' Chevy Scotsdale 350

Discussion in 'Chevy C/K Truck Forum' started by racefann82003, Nov 9, 2006.

  1. racefann82003

    racefann82003 New Member

    I have a 79' chevy 1/2 ton 4x4 pick-up, I replaced many parts and upgraded parts like , carb,headers,intake,etc......My problem is ,I hear a spark knock at high speeds or climbing hills. How do i eliminate this noise. Is there something i overlooked in my upgrades, or is it just fine tuning the timing or ajusting the carb??????? I need help??????
  2. ChevyFan

    ChevyFan Administrator Staff Member 5+ Years 5000 Posts

    RE: 79

    How loud is the noise?
  3. racefann82003

    racefann82003 New Member

    79' 350 chevy

    the noise sounds like a bad gas sound , not very loud but very annoying,, i have headman headers and glass packs with staight pipes to get an idea, and i can hear it from inside the cab,,,,,,,
  4. ProzacKid

    ProzacKid Rockstar 100 Posts

    RE: 79

    Is it an original 350 from 79 in your Scotsdale? If so, how many miles, etc?
  5. Aeropagus

    Aeropagus Rockstar Platinum Contributor 100 Posts

    RE: 79

    Are you hearing the knock mostly under load? I agree, more information on the age/condition of your engine will give some clues.
  6. GaryL

    GaryL Epic Member 5+ Years ROTM Winner 1000 Posts Platinum Contributor

    You can back the timing off a little or try running a higher grade of gas. Either should help, but the gas is the easiest to start with.
  7. ChevyFan

    ChevyFan Administrator Staff Member 5+ Years 5000 Posts

    Yes, it's always best to start simple. Keep the tank full, try a different brand with different additives and higher octane, etc.
  8. ChevyFan

    ChevyFan Administrator Staff Member 5+ Years 5000 Posts

    any news?

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