Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

Important: Be sure to keep parts in order. Parts must be reinstalled into the original location and position.

Install the valve pushrods.

Fig 1: Installing Valve Pushrods
Courtesy of GENERAL MOTORS CORP.

Important: Be sure that the arrow on the valve rocker arm support is in the up position.
Install the valve rocker arm supports.

Fig 2: Installing Valve Rocker Arm Supports
Courtesy of GENERAL MOTORS CORP.
Apply prelube GM P/N 12345501 (Canadian P/N 992704) or equivalent to the following valve rocker arm contact surfaces:
- Valve pushrod socket (1)
- Roller pivot (2)
- Valve stem tip (3)
  
  Fig 3: Applying Prelube To Valve Rocker Arm Contact Surfaces
  Courtesy of GENERAL MOTORS CORP.
Install the valve rocker arm assemblies as follows:
1. Finger start the bolt at location (1)
2. Finger start the bolt at location (2)
3. Finger start the bolt at location (3)
4. Finger start the remaining valve rocker arm bolts
  
  Fig 4: Installing Valve Rocker Arm Assemblies
  Courtesy of GENERAL MOTORS CORP.
Rotate the crankshaft balancer to position the crankshaft balancer alignment mark (1) 57-63 degrees clockwise or counterclockwise from the engine front cover alignment tab (2).
CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

Important: Once the valve rocker arm assemblies are installed and properly torqued, no additional valve lash adjustment is required.
Tighten the valve rocker arm bolts.
Tighten

Tighten the valve rocker arm bolts to 30 N.m (22 lb ft).
Install the valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement - Left or Valve Rocker Arm Cover Replacement - Right .

Fig 5: Positioning Crankshaft Balancer Alignment Mark
Courtesy of GENERAL MOTORS CORP.