Intake manifold with internal passages arranged to simplify coring

A single level intake manifold for supplying air and exhaust gas to a V-type internal combustion engine having combustion chambers disposed along opposite sides of a longitudinal centerline, said manifold comprising a casting having a pair of generally vertical riser passages transversely spaced on opposite sides of said centerline, a pair of generally horizontal plenum chambers transversely spaced on opposite sides of said centerline and extending longitudinally at a common level, each connecting with the bottom of one of said riser passages, runner passages extending from said plenum chambers laterally away from said centerline, an exhaust gas crossover passage extending transversely under and in heat exchange relation with the surface of said plenum chambers below said riser passages, an exhaust gas recirculation feed passage connected with and extending from said exhaust crossover passage to means for receiving an exhaust gas recirculation control valve adapted to meter the flow of exhaust gas through said exhaust gas recirculation feed passage, and a metered exhaust gas recirculation passage extending from said valve receiving means longitudinally along said centerline and between said plenum chambers and their connecting riser passages, said metered exhaust gas recirculation passage being joined laterally with said riser passages by short lateral passages therebetween, said plenum chambers and said passages all being formed by coring and said plenum chambers, runner passages, riser passages, lateral passages and metered exhaust gas recirculation passage being joined and having no unconnected portions extending in vertically overlapping relation with one another whereby said joined chambers and passages may be formed by a single monolevel core, while the exhaust crossover passage and the exhaust gas recirculation feed passage connected thereto may be formed by a second monolevel core.