For 1990-2009 cars

1. Verify that the keyway on the crankshaft (2) is properly positioned.
2. Apply engine oil to the camshaft journals and lobes.
3. Install the camshaft aligning the guide pin (3) with the mark (4) on the cylinder head. The exhaust camshaft rear end is slotted to mate with the camshaft position sensor.
4. Install the dowel pins (2) to the cylinder head.
5. Apply a bead of GM P/N 12346240, Canadian P/N 10953493 or equivalent to the exhaust camshaft end housing sealing surface (3).

Important: Cylinder head and camshaft damage may result if the bearing caps are incorrectly installed.

6. Install the camshaft bearing caps. The caps are marked intake or exhaust (1), position away from the timing chain (2), and direction toward the timing chain (3).
7. Apply oil to the camshaft bearing cap bolts.

Notice: 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.

8. Tighten the camshaft bearing caps.

Tighten
Tighten the camshaft bearing caps in 3 progressive steps in the sequence shown to 12 N·m (8.5 lb ft).

9. Install the camshaft position (CMP) sensor. Refer to Camshaft Position Sensor Replacement .