Sierra 1500 2WD V8-4.8L (2007)
21. Install NEW intake manifold gaskets (514) to the intake manifold.
22. Remove the covers from the cylinder head passages.
23. Install the intake manifold (500).
Important: The aid of an assistant may be helpful in holding the engine harness up out of the way so the upper intake manifold cover does
not get caught against the engine harness.
24. Tighten the intake manifold bolts (512) until snug.