An intake manifold assembly for a vehicle engine includes an intake manifold housing defining a main chamber having perimeter walls and an open upper end; a charge air cooler (CAC) positioned in the main chamber and having an upper cover plate defining a sealing flange; and an integrated positive crankcase ventilation (PCV) system. The PCV system includes a PCV chamber integrally formed into an upper surface of one of the perimeter walls, the PCV chamber having an open upper end; a PCV port integrally formed with the intake manifold housing and in fluid communication with the PCV chamber; a distribution port defined by a wall of the PCV chamber and in fluid communication with an outlet plenum of the intake manifold. Upon securing the CAC to the intake manifold housing, the CAC sealing flange provides a sealed closure for the intake manifold main chamber and the PCV chamber.