Tools Required

J 36660-A Torque Angle Meter

Important: All gasket mating surfaces must be free of oil and foreign material. Use GM P/N 12346139 (Canadian P/N 10953463) or equivalent to clean surfaces.

Important: Do Not apply RTV sealer to the engine block before/prior to the installation of the manifold gaskets. RTV sealer is not to be placed under the lower intake manifold gaskets.

1. Install the lower intake manifold gaskets.



2. Coat the ends of the push rods using prelube GM P/N 1052367, (Canadian P/N 992869) or the equivalent.

Important: 1995 and earlier engines use hardened pushrods and steel pushrod guide plates. For service of 1995 and earlier engines, only intake pushrods with purple markings and exhaust pushrods with orange markings can be used. Failure to do so may result in engine damage.

Intake pushrods from 1996 and newer engines have either yellow or purple markings. Exhaust pushrods from 1996 and newer engines have either green or orange markings.
All intake pushrods measure 144.18 mm (5.68 in) long, and all exhaust pushrods measure 152.51 mm (6.0 in) long.
3. Install the push rods in their original location.



4. Coat the rocker arm friction surfaces using prelube GM P/N 1052367, (Canadian P/N 992869) or the equivalent.

Important: Shims may be required under the valve rocker arm pedestals if reconditioning has been performed on the cylinder head or its components.

5. Install the valve rocker arms in their original positions.

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.

6. Install the valve rocker arm bolts.

Tighten
Use the J 36660-A to tighten the valve rocker arm bolts to 15 N·m (11 lb ft) plus 30 degrees.