GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 1277108  Size: SH
  1. Remove the engine sight cover. Refer to Upper Intake Manifold Sight Shield Replacement .
  2. Remove the spark plug wires. Refer to Spark Plug Wire Replacement in Engine Controls - 6.0L.
  3. Remove the ignition coils. Refer to Ignition Coil Replacement in Engine Controls - 6.0L.
  4. Remove the valve rocker arm cover bolts.
  5. Remove the valve rocker arm cover.

  6. Object Number: 490696  Size: SH
  7. Remove the gasket (1) from the rocker cover.
  8. Discard the OLD gasket.

Installation Procedure

Important: 

   • All gasket surfaces should be free of oil an/or other foreign material during assembly.
   • DO NOT reuse the valve rocker arm cover gasket.
   • The valve rocker arm cover bolt grommets may be reused.
   • If the positive crankcase ventilation (PCV) valve grommet has been removed from the rocker cover, install a NEW grommet during assembly.


    Object Number: 490696  Size: SH
  1. Install a NEW rocker cover gasket (1) into the groove of the valve rocker arm cover.

  2. Object Number: 1277108  Size: SH
  3. Install the valve rocker arm cover onto the cylinder head.
  4. Install new rocker arm cover grommets, if necessary.
  5. Notice: Refer to Fastener Notice in the Preface section.

  6. Install the rocker arm cover bolts.
  7. Tighten
    Tighten the valve rocker arm cover bolts to 12 N·m (106 lb in).

  8. Install the ignition coils. Refer to Ignition Coil Replacement in Engine Controls - 6.0L.
  9. Install the spark plug wires. Refer to Spark Plug Wire Replacement in Engine Controls - 6.0L.
  10. Install the engine sight cover. Refer to Upper Intake Manifold Sight Shield Replacement .