Cylinder Head Installation - Right Side (LS3 or L99)

Special Tools

• J 42385-100  Thread Repair Kit
• J 45059  Angle Meter

For equivalent regional tools, refer to Special Tools

Fig 1: Cylinder Head Gasket & Locating Pins - Right
Courtesy of GENERAL MOTORS COMPANY
WARNING:

Refer to Safety Glasses Warning .

CAUTION:

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.

NOTE:
• Do not use the cylinder head bolts again. Install NEW cylinder head bolts during assembly.
• Do not use any type of sealant on the cylinder head gasket, unless specified.
• The cylinder head gaskets must be installed in the proper direction and position.
1. Clean the engine block cylinder head bolt holes, if required.

   Thread repair tool J 42385-107 may be used to clean the threads of old threadlocking material.

2. Spray cleaner GM P/N 12346139 (Canadian P/N 10953463), GM P/N 12377981 (Canadian P/N 10953463), or equivalent, into the hole.
3. Clean the cylinder head bolt holes with compressed air.
4. Install the cylinder head locating pins (230).
Fig 2: Cylinder Head Locating Pins
Courtesy of GENERAL MOTORS COMPANY
5. Inspect the locating pins for proper installation.
Fig 3: Gasket Displacement Markings - Right
Courtesy of GENERAL MOTORS COMPANY
6. Inspect the displacement markings on the gasket for proper usage.
Fig 4: Cylinder Head Gasket & Locating Pins - Right
Courtesy of GENERAL MOTORS COMPANY
7. Install the NEW cylinder head gasket (217) onto the locating pins.
Fig 5: Right Cylinder Head & Bolts
Courtesy of GENERAL MOTORS COMPANY
8. Install the cylinder head (218) onto the locating pins and the gasket.
9. Install the NEW cylinder head bolts (220, 221).
Fig 6: Cylinder Head Bolt Tightening Sequence
Courtesy of GENERAL MOTORS COMPANY
CAUTION:

Refer to Fastener Caution .

10. Tighten the cylinder head bolts:
    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  meter.
    3. Tighten the M11 cylinder head bolts (1-10) a final pass in sequence to 70 degrees using the J 45059  meter.
    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.