GM Service Manual Online
For 1990-2009 cars only

Special Tools

J 45059 Angle Meter

Removal Procedure


    Object Number: 153597  Size: MH
  1. Remove the ignition control module and bracket. Refer to Ignition Control Module Replacement .
  2. Remove the lower intake manifold. Refer to Lower Intake Manifold Replacement .
  3. Remove the left push rods and rocker arms. Refer to Valve Rocker Arm and Push Rod Replacement .
  4. Remove the left exhaust manifold. Refer to Exhaust Manifold Replacement - Left Side .
  5. Remove and discard the cylinder head bolts.
  6. Remove the cylinder head.

  7. Object Number: 406043  Size: SH
  8. Remove the cylinder head gasket.
  9. Remove the caps, springs, valves and seals from the cylinder head. Refer to Cylinder Head Disassemble .
  10. Inspect the engine block. Refer to Engine Block Cleaning and Inspection .
  11. Inspect the cylinder head. Refer to Cylinder Head Cleaning and Inspection .
  12. Clean the gasket mating surfaces on the cylinder head, the cylinder block and the intake manifold.
  13. Clean the cylinder block bolt hole threads.

Installation Procedure

    Notice: Head gaskets are not interchangeable. The head gasket must be installed with the arrow pointing to the front of the engine. Installing the head gasket in any other direction will cause gasket failure and possible engine failure.


    Object Number: 406043  Size: SH
  1. Install the valves, seals, springs and the caps to the cylinder head. Refer to Cylinder Head Assemble .
  2. Position the head gasket with the arrow pointing to the front of the engine.

  3. Object Number: 153597  Size: MH
  4. Install the cylinder head.
  5. Notice: Refer to Fastener Notice in the Preface section.

    Notice: This bolt is designed to permanently stretch when tightened, and therefore MUST be replaced anytime it is removed. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged.

    Notice: This engine uses special torque to yield head bolts. This design bolt requires a special tightening procedure. Failure to follow the given procedure will cause head gasket failure and possible engine damage.


    Object Number: 38826  Size: SH
  6. Install NEW cylinder head bolts (1-8).
  7. Tighten

        • Tighten the bolts (1-8) in the sequence shown to 50 N·m (37 lb ft).
        • Using the J 45059 rotate the bolts (1-8) in sequence an additional 120 degrees.
  8. Install the left exhaust manifold. Refer to Exhaust Manifold Replacement - Left Side .
  9. Install the left push rods and rocker arms. Refer to Valve Rocker Arm and Push Rod Replacement .
  10. Install the lower intake manifold. Refer to Lower Intake Manifold Replacement .
  11. Install the ignition control module and bracket. Refer to Ignition Control Module Replacement .
  12. Inspect for leaks.