GM Service Manual Online
For 1990-2009 cars only

Cylinder Head Installation - Right Side LY7/LP1

Tools Required

J 45059 Angle Meter

  1. Ensure the cylinder head locating pins are securely mounted in the cylinder block deck face.

  2. Object Number: 902817  Size: SH
  3. Install a NEW right cylinder head gasket using the deck face locating pins for retention.

  4. Object Number: 902818  Size: SH
  5. Align the right cylinder head with the deck face locating pins.
  6. Place the right cylinder head in position on the deck face.
  7. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 2126651  Size: SH

    Important: DO NOT allow oil on the cylinder head bolt bosses.

    Important: DO NOT reuse the old cylinder head bolts.

  8. Install the NEW M11 cylinder head bolts (1).
  9. Tighten

    1. Tighten the M11 cylinder head bolts a first pass in sequence to 30 N·m (22 lb ft).
    2. Tighten the M11 cylinder head bolts a second pass in sequence an additional 150 degrees using the J 45059 .
  10. Install the NEW M8 cylinder head bolt (2).
  11. Tighten

    1. Tighten the M8 cylinder head bolt a first pass to 15 N·m (11 lb ft).
    2. Tighten the M8 cylinder head bolt a second pass an additional 75 degrees using the J 45059 .

Cylinder Head Installation - Right Side LLT

Special Tools

J 45059 Angle Meter


    Object Number: 902817  Size: SH
  1. Ensure the cylinder head locating pins are securely mounted in the cylinder block deck face.
  2. Install a NEW right cylinder head gasket using the deck face locating pins for retention.

  3. Object Number: 1977926  Size: SH
  4. Align the right cylinder head with the deck face locating pins.
  5. Place the right cylinder head in position on the deck face.
  6. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 2126651  Size: SH

    Important: DO NOT allow oil on the cylinder head bolt bosses.

    Important: DO NOT reuse the old cylinder head bolts.

  7. Install the NEW M11 cylinder head bolts (1).
  8. Tighten

    1. Tighten the M11 cylinder head bolts a first pass in sequence to 30 N·m (22 lb ft).
    2. Tighten the M11 cylinder head bolts a second pass in sequence an additional 150 degrees using the J 45059 .
  9. Install the NEW M8 cylinder head bolt (2).
  10. Tighten

    1. Tighten the M8 cylinder head bolt a first pass to 15 N·m (11 lb ft).
    2. Tighten the M8 cylinder head bolt a second pass an additional 75 degrees using the J 45059 .