GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Engine 🢒 Engine Mechanical - 8.1L 🢒 Exhaust Manifold Installation - Left Side

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 470683 Size: SH
  1. Install the exhaust manifold studs into the cylinder head, if necessary.

    2. Tighten
    Tighten the exhaust manifold studs to 20 N·m (15 lb ft).


    Object Number: 470686 Size: SH
  2. Install the NEW left exhaust manifold gasket.
  3. Install the left exhaust manifold.
  4. Install the left exhaust manifold nuts and center bolt.

    5. Tighten

        • Tighten the left exhaust manifold center bolt to 35 N·m (26 lb ft).
        • Tighten the left exhaust manifold nuts to 16 N·m (12 lb ft).

    Object Number: 784332 Size: SH
  5. Install the left exhaust manifold heat shield.
  6. Install the left exhaust manifold heat shield bolts and nuts.

    7. Tighten
    Tighten the left exhaust manifold heat shield bolts and nuts to 25 N·m (18 lb ft).


    Object Number: 470690 Size: SH
  7. Install the left spark plugs.

    8. Tighten
    Tighten the left spark plugs to 20 N·m (15 lb ft).


    Object Number: 1309937 Size: SH

    Important: Fully install the spark plug wire by pushing on the exposed end of the spark plug boot. Do not push the spark plug wire onto the spark plug by using the metal heat shield.

  8. Install the left spark plug wires to the spark plugs and ignition coils.