GM Service Manual Online
For 1990-2009 cars only

Special Tools

J 45059 Angle Meter

Removal Procedure

Important: During disassembly, keep the valve train components together and identified in order to install the components in their original locations.

Perform a compression test. Refer to Engine Compression Test . Record the results before you perform the following repairs:

   • Remove the cylinder heads.
   • Disassemble the valve mechanism.

  1. Remove lower intake manifold. Refer to Lower Intake Manifold Replacement .
  2. Remove the exhaust crossover pipe. Refer to Exhaust Crossover Pipe Replacement .
  3. Raise the support the vehicle. Refer to Lifting and Jacking the Vehicle .
  4. Remove catalytic converter from exhaust manifold. Refer to Catalytic Converter Replacement .
  5. Lower the vehicle.
  6. Remove the rocker arms and pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .

  7. Object Number: 52299  Size: SH
  8. Remove and discard the cylinder head bolts.
  9. Remove the cylinder head and gasket. Discard the gasket.
  10. Clean the mating surfaces on the following items:
  11. • The cylinder head
    • The cylinder block
    • The intake manifold
  12. Clean the cylinder block bolt threads.
  13. If replacing cylinder head, remove the following components:
  14. • Exhaust manifold
    • Refer to Exhaust Manifold Replacement - Right Side .
    • Accessory studs
    • Spark plugs

Installation Procedure

  1. If removed, install the following components:
  2. • Exhaust manifold
    •  Refer to Exhaust Manifold Replacement - Right Side .
    • Accessory studs
    • Spark plugs

    Object Number: 54362  Size: SH
  3. Place the cylinder head gasket in position over the dowel pins. Ensure that the THIS SIDE UP note is showing.

  4. Object Number: 1369266  Size: SH
  5. Install the cylinder head.
  6. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 826677  Size: SH

    Notice: This component uses torque-to-yield bolts. When servicing this component do not reuse the bolts, New torque-to-yield bolts must be installed. Reusing used torque-to-yield bolts will not provide proper bolt torque and clamp load. Failure to install NEW torque-to-yield bolts may lead to engine damage.

  7. Install the new cylinder head bolts.
  8. Tighten

    1. Tighten the cylinder head bolts a first pass to 60 N·m (44 lb ft).
    2. Tighten the cylinder head bolts a final pass in sequence to 95 degrees using the J 45059 .
  9. Install the intake gasket.
  10. Install the pushrods and rocker arms. Refer to Valve Rocker Arm and Push Rod Replacement .
  11. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  12. Install catalytic converter to manifold. Refer to Catalytic Converter Replacement .
  13. Lower the vehicle.

  14. Object Number: 54282  Size: SH
  15. Install the exhaust crossover pipe. Refer to Exhaust Crossover Pipe Replacement .

  16. Object Number: 54366  Size: SH
  17. Install the intake manifolds. Refer to Lower Intake Manifold Replacement and Upper Intake Manifold Replacement .
  18. Connect negative battery cable.
  19. Fill the cooling system. Refer to Cooling System Draining and Filling .