GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • J 42385-100 Head/Main Bolt Thread Repair Kit
    • J 45059 Angle Meter

    Caution: Refer to Safety Glasses Caution in the Preface section.


    Object Number: 63235  Size: SH

    Notice: Clean all dirt, debris, and coolant from the engine block cylinder head bolt holes. Failure to remove all foreign material may result in damaged threads, improperly tightened fasteners or damage to components.

    Important: 

       • Do not use the cylinder head bolts again. Install NEW cylinder head bolts during assembly.
       • Do not use any type sealant on the cylinder head gasket, unless specified.

  1. Clean the engine block cylinder head bolt holes, if required.
  2. Thread repair tool J 42385-107 may be used to clean the threads of old threadlocking material.

  3. Spray cleaner GM P/N 12346139 (Canadian P/N 10953463), GM P/N 12377981 (Canadian P/N 10953463), or equivalent, into the hole.
  4. Clean the cylinder head bolt holes with compressed air.
  5. Check the cylinder head locating pins for proper installation.

  6. Object Number: 1332950  Size: SH
  7. Inspect the displacement markings (1) on the gasket for proper usage.

  8. Object Number: 63169  Size: SH

    Important: When properly installed, the tab on the left cylinder head gasket will be located left of center, or closer to the front of the engine.

  9. Install the NEW left cylinder head gasket onto the locating pins.

  10. Object Number: 1424500  Size: SH
  11. Install the cylinder head onto the locating pins and the gasket.
  12. Install the NEW cylinder head bolts.
  13. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 260150  Size: SH
  14. Tighten the cylinder head bolts.
  15. Tighten

    1. Tighten the M11 cylinder head bolts (1-10) a first pass in sequence to 30 N·m (22 lb ft).
    2. Tighten the M11 cylinder head bolts (1-10) a second pass in sequence to 90 degrees using the J 45059 .
    3. Tighten the M11 cylinder head bolts (1-10) a final pass in sequence to 70 degrees using the J 45059 .
    4. Tighten the M8 cylinder head bolts (11-15) to 30 N·m (22 lb ft). Begin with the center bolt (11) and alternating side-to-side, work outward tightening all of the bolts.