For 1990-2009 cars only
- Install NEW intake manifold-to-cylinder head gaskets (1).
- Install the intake manifold to the engine.
- Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the threads of the intake manifold bolts (1). Refer to Sealers, Adhesives, and Lubricants .
- Install the fuel rail stop bracket (2).
- Install the manifold bolts.
- Tighten intake manifold bolts a first pass in sequence to 5 N·m (44 lb in).
- Tighten intake manifold bolts a final pass in sequence to 10 N·m (89 lb in).
- Install the knock sensor wire harness connector (1) onto the fuel rail stop bracket (2).
- Note the location of the fuel rail ground strap (1) on the intake manifold.
- Install the manifold absolute pressure (MAP) sensor, if previously removed.
- Install the positive crankcase ventilation (PCV) valve pipe to the right rocker cover and intake manifold - LS1.
- Install the PCV strap and nut onto the right front vapor vent pipe stud - LS1.
- Install the PCV valve pipe (1) to the valley cover and intake manifold - LS6.
- Install the PCV valve pipe to the left rocker cover.
Important: The intake manifold, throttle body, fuel injection rail and fuel injectors may be removed as an assembly. If not servicing the individual components, install the intake manifold as a complete assembly.
DO NOT use intake manifold gaskets again. Install NEW intake manifold-to-cylinder head gaskets.
Notice: Refer to Fastener Notice in the Preface section.
Tighten
The fuel rail ground strap must be installed during assembly.
Tighten
Tighten the PCV strap nut to 12 N·m (106 lb in).
