You will need to drain the cooling system and remove the upper
Intake Manifold, then remove the heater inlet pipe, disconnect the radiator inlet hose from the thermostat housing, remove the fuel rail assembly and the lower intake manifold bolts, then remove the lower intake manifold from the engine. If replacing the lower intake manifold, you should remove the thermostat and housing. Then you can remove the rocker arms and push rods, and the lower intake manifold gaskets.