The right side Exhaust Manifold replacement for 4.8l, 5.3l, and 6.0l engines requires vehicle suspension and Exhaust Manifold pipe nut removal. Start by lowering the vehicle before removing
Spark Plugs then Exhaust Manifold bolts underside the manifold alongside its gasket which should be disposed. You should remove heat shield bolts and shield from the Exhaust Manifold when required. Measure and clean the Exhaust Manifold before inspection. In order to install the heat shield along with its bolts onto the Exhaust Manifold you must tighten the bolts to 9 nm (80 inch lbs.). The threaded hole sections in cylinder head Exhaust Manifold must be clean from debris and threadlocking substance before applying any sealant to only first three bolt threads. The procedure requires applying threadlock gm p/n 12345493 (Canadian P/N 10953488) or equivalent along 5 mm (0.2 inch) wide areas on the Exhaust Manifold bolts threads. The installation process requires fitting the Exhaust Manifold combined with a new gasket and bolts that need initial torque to 15 nm (11 ft. Lbs.) while starting with the center two bolts and moving alternately side-to-side towards the outside bolts before completing with a repeated pass at 25 nm (18 ft. Lbs.) through the same pattern. Use a flat punch to bend the exposed edges of the Exhaust Manifold Gasket located at the front of the right cylinder head followed by the installation of spark plugs. Reposition the vehicle before installing the Exhaust Manifold pipe nuts at 50 nm torque values followed by the final step of vehicle lowering.