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Remove the 'Vortec' cover from the intake manifold (right on top). Coming off of the rear 1/3 of the intake manifold is a black tube, approx. 3/4 in dia., wrapped in a soft foam sleeve. Follow this down and back, to where it meets the rear of the engine block. Pull up firmly and the PCV valve will pop out of the block. It will still be connected to the tube, there is a nipple on the valve which prevents it from being pulled out easily. Grasp the tube with one hand, the body of the PCV valve with the other, pull firmly, and the valve should come out. If you're replacing the PCV valve, make sure you really need to do so. Some GMC trucks come with a fixed orifice PCV valve, which is hollow, nothing inside. There is no need to replace this style of PCV valve, as, obviously, there's nothing that can go wrong with it.
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