Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 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: View Of Valve Pushrods

GM480529

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: Installing Rocker Arm Supports

GM480578

Courtesy of GENERAL MOTORS CORP.

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

GM480551

Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the rocker arms 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 rocker arm bolts

Fig 4: Installing Rocker Arms

GM480580

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).

Fig 5: View Of Crankshaft Balancer Alignment Mark & Engine Front Cover Alignment Tab

GM334551

Courtesy of GENERAL MOTORS CORP.

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