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Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by trivers, Nov 19, 2007.

  1. trivers

    trivers New Member

    Just need to know what TDC is. I cant see any markings anymore so is TDC the large point or the large notch. It is saw tooth looking and has four points so is it the point or valley
  2. unplugged

    unplugged Epic Member 5+ Years 1000 Posts

    The timing mark indicator is etched with the numbers. I would verify your marks before setting. Mine has the numbers 12, 8, 4, 0 from left to right. For me TDC is the first notch on the right side. Too dark for a picture, but this graphic does give you an idea.

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