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Anonymous Posted on Dec 24, 2010

What isthe timeing specs for a 1990 gmc 1500 4.3l

  • Anonymous Dec 24, 2010

    The timeing mark,

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  • Contributor 11 Answers
  • Posted on Dec 24, 2010
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Are you looking for the timing marks or the firing order if it is the fire order it is stamped on the intake by the thermostat

  • Anonymous Dec 25, 2010

    If you look down between the water pump and the alternateyou will see the timing mark on the block then crawl under the front of the truck the other on is on the crank shaft Polly it will be a little notch on the out rim of the pulyi was a pencil or a wax pen to mark it it will be a inch long

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