Installation Procedure

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Ensure number 1 cylinder is at top dead center.

If installing new cylinder head, refer to Cylinder Head Assemble .
Install the dowel pins, cylinder head locator, if necessary.
Install a new cylinder head gasket.

Fig 1: Installing New Cylinder Head Gasket
Courtesy of GENERAL MOTORS CORP.
Install the cylinder head.

Fig 2: Installing Cylinder Head
Courtesy of GENERAL MOTORS CORP.
Install new cylinder head bolts.

Fig 3: Installing Cylinder Head Bolts
Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
Tighten the new cylinder head bolts in the following sequence:
Tighten
1. 6.1. Tighten the cylinder head bolts (1-14) in sequence to 30 N.m (22 lb ft).
2. 6.2. Use J 36660-A to tighten the cylinder head bolts in sequence an additional 155 degrees.
3. 6.3. Tighten the (2 Short) end bolts to 7 N.m (62 lb in).
  Use J 36660-A to tighten the short cylinder head end bolts an additional 60 degrees.
4. 6.4. Tighten the (1 Long) end bolt to 7 N.m (62 lb in).
  Use J 36660-A to tighten the long cylinder head end bolt an additional 120 degrees.
  
  Fig 4: Tightening Sequence Of Cylinder Head Bolts
  Courtesy of GENERAL MOTORS CORP.
Install the cylinder head access hole plugs.
Tighten

Tighten the plugs to 5 N.m (44 lb in).
Install the timing chain and sprockets. Refer to TIMING CHAIN, SPROCKETS, AND/OR TENSIONER REPLACEMENT .
Install the front cover. Refer to ENGINE FRONT COVER REPLACEMENT .
Install the camshaft cover. Refer to CAMSHAFT COVER REPLACEMENT .
Install the exhaust manifold. Refer to EXHAUST MANIFOLD REPLACEMENT (4.2L ENGINE) .

Fig 5: Installing Cylinder Head Access Hole Plugs
Courtesy of GENERAL MOTORS CORP.