An internal combustion engine is provided having an engine block defining a pressurized oil source and rotatably supporting a crankshaft. A camshaft is rotatably mounted within the engine block and defines an axially extending cavity. The cavity extends between opposed first and second ends of the camshaft. A cam phaser is mounted to the second end of the camshaft and is operable to vary the timing of the camshaft with respect to the crankshaft in response to pressurized oil. A cover is removably mounted to the engine block and is operable to substantially enclose the first end of the camshaft. The cover at least partially defines a passage in communication with the pressurized oil source and cavity. The passage and the cavity are operable to communicate pressurized oil from the pressurized oil source to the cam phaser to actuate the cam phaser.