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.
   NOTE: When replacing lower intake manifold gasket, a revised intake manifold gasket has been introduced by manufacturer. This new design gasket helps resolve issues related to intake manifold oil/coolant leaks. The gasket requires a revised torque specification and procedure in addition to the use of NEW revised intake manifold bolts. Please review TSB ENGINE OIL OR COOLANT LEAK (INSTALL NEW INTAKE MANIFOLD GASKET) for complete information.
   Fig 1: Installing Lower Intake Manifold Gasket

   Courtesy of GENERAL MOTORS CORP.
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.

   The exhaust valve push rods measure 152.5 mm (6.0 in) in length.

   Fig 2: Installing Push Rods

   Courtesy of GENERAL MOTORS CORP.
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.
6. Install the valve rocker arm bolts.

   Tighten 

   Tighten the valve rocker arm bolts to 42 N.m (31 ft. lbs.).

   Fig 3: Installing Rocker Arms

   Courtesy of GENERAL MOTORS CORP.