- Install the upper intake manifold gaskets and manifold.
 
- Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the upper intake manifold bolt threads.
 
Caution: Refer to Fastener Caution in the Preface section.
- Install the upper intake manifold bolts, stud, and manifold absolute pressure (MAP) sensor bracket. Tighten the upper intake manifold bolts and stud to 
25 N·m (18 lb ft).
 
- Install the foul air positive crankcase ventilation (PCV) tube.