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  1. #1

    Default 79' Chevy Scotsdale 350

    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. #2

    Default RE: 79

    How loud is the noise?

  3. #3

    Default 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. #4

    Default RE: 79

    Is it an original 350 from 79 in your Scotsdale? If so, how many miles, etc?
    Some people call me the space cowboy ... some people don't.

    2010 Chevy Silverado Z71 Just picked it up
    2007 Chevy Colorado Just traded her in!

  5. #5
    Sr. Engineer Aeropagus's Avatar
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    Default 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.
    John ~ New Mexico ~ It's all about the bowtie!
    2007 GMC Envoy & 2010 GMC Sierra

  6. #6

    Default

    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.
    Gary

    99 K 1500 Suburban
    78 Silverado Big 10 w/factory 454
    00 S-10 Blazer
    1976 Trans Am
    1980 Honda CB900 Custom

  7. #7

    Default

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

  8. #8

    Default

    any news?

    Steve
    10 Chevy Traverse LT AWD
    02 Chevy Trailblazer LS (110K+ miles - loaded except for 4WD - WRECKED!)
    99 Chevy Cavalier LS (105K+ miles - commuter car)
    78 Chevy Suburban Silverado (454, 3/4 ton)
    62 GMC 3/4 ton Pickup (350 police interceptor)

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  1. 92 scotsdale 350-6.0 L conversion?Help!
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    Last: 09-02-2009, 02:32 PM

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