GM Service Manual Online
For 1990-2009 cars only

    Object Number: 897124  Size: SH
  1. Loosen the adjusting nuts (217) and bolts (216).

  2. Object Number: 897125  Size: SH
  3. Loosen the left side rocker shaft retaining bolts in sequence. Loosen the shaft mounting bolts 2 turns at a time in sequence, to prevent damaging the valves or rocker arms.

  4. Object Number: 1308051  Size: SH
  5. Loosen the right side rocker shaft retaining bolts in sequence. Loosen the shaft mounting bolts 2 turns at a time in sequence, to prevent damaging the valves or rocker arms.

  6. Object Number: 897119  Size: SH

    Important: Identify parts as they are removed so they can be installed in their original locations if used again. When removing or installing the rocker arm shaft assembly, do not remove the rocker arm shaft mounting bolts. The bolts will retain the springs and rocker arms on the shaft.

  7. Remove the bolts (214) and valve rocker arm and shaft assemblies.
  8. Remove the lash adjusters (207).

  9. Object Number: 897120  Size: SH
  10. Remove the intake valve rocker arms as an assembly (215) from the shaft (221). Refer to Separating Parts .
  11. Remove the exhaust valve rocker arms (218) and springs (219) from the shaft (220).
  12. Remove the nuts (217) and bolts (216), if required.

  13. Object Number: 897121  Size: SH
  14. Note the installed positions of the exhaust valve rocker arms (218).