For 1990-2009 cars only
- Clean the lower intake manifold sealing surface using GM P/N 12346139 (Canadian P/N 10953463) or equivalent prior to installing any seals or gaskets.
- Install the lower intake manifold gaskets and seals.
- With gaskets and seals in place, apply a small drop 8-10 mm (0.31-0.39 in) of RTV sealer GM P/N 12378521 (Canadian P/N 88901148) or equivalent, to the 4 corners of the intake manifold to block joints (1).
- Install the lower intake manifold.
- Apply threadlocker 272 GM P/N 12345493 (Canadian P/N 10953488) or the equivalent to the bolt threads.
- Install the lower intake manifold 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.
Tighten
Tighten the lower intake manifold bolts in sequence to 15 N·m (11 lb ft).
