GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 45059 Torque Angle Meter

Removal Procedure

  1. Remove the supercharger. Refer to Supercharger Replacement .
  2. Remove the intake manifold. Refer to Intake Manifold Replacement .
  3. Remove the exhaust manifold. Refer to Exhaust Manifold Replacement .
  4. Remove the timing chain. Refer to Camshaft Timing Chain, Sprocket, and Tensioner Replacement .
  5. Drain the cooling system. Refer to Cooling System Draining and Filling .

  6. Object Number: 465863  Size: SH
  7. Remove the cylinder head bolts in sequence and discard.

  8. Object Number: 412427  Size: SH
  9. Remove the cylinder head and gasket.
  10. Clean all gasket surfaces.

Installation Procedure


    Object Number: 412427  Size: SH
  1. Install the cylinder head and gasket.
  2. Install NEW cylinder head bolts.
  3. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 412510  Size: SH
  4. Tighten the cylinder head bolts in sequence.
  5. Tighten
    Using a J 45059 tighten the cylinder head bolts to 30 N·m (22 lb ft) plus 155 degrees.


    Object Number: 412425  Size: SH
  6. Install the NEW front cylinder head bolts.
  7. Tighten
    Tighten the front cylinder head bolts to 35 N·m (26 lb ft).

  8. Install the timing chain. Refer to Camshaft Timing Chain, Sprocket, and Tensioner Replacement .
  9. Install the exhaust manifold. Refer to Exhaust Manifold Replacement .
  10. Lower the vehicle.
  11. Install the intake manifold. Refer to Intake Manifold Replacement .
  12. Install the supercharger. Refer to Supercharger Replacement .
  13. Fill the cooling system. Refer to Cooling System Draining and Filling .