Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. 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 pushrods.

Fig 1: Pushrods
Courtesy of GENERAL MOTORS CORP.

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

Fig 2: Rocker Arm Supports
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Apply lubricant GM P/N 12345501, (Canadian P/N 992704), or equivalent to the following rocker arm contact surfaces:
- Pushrod socket (1)
- Roller pivot (2)
- Valve stem tip (3)
Fig 3: Pushrod Socket, Roller Pivot & Valve Stem Tip
Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to FASTENER NOTICE .
Install the rocker arms as follows:
1. 4.1. Finger start the bolt at location (1)
2. 4.2. Finger start the bolt at location (2)
3. 4.3. Finger start the bolt at location (3)
4. 4.4. Finger start the remaining rocker arm bolts
Fig 4: Rocker Arms Bolt Locations
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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).
IMPORTANT: Once the rocker arms are installed and properly torqued, no additional valve lash adjustment is required.
Tighten the rocker arm bolts.
Tighten

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

Fig 5: Crankshaft Balancer Alignment Mark & Engine Front Cover Alignment Tab
Courtesy of GENERAL MOTORS CORP.