Engine assembly including cooling system

An engine assembly comprising:

• a coolant pump in communication with a coolant fluid and including a pump inlet and a pump outlet;
• a V-configuration engine structure including a V-configuration engine block and a pair of cylinder heads mounted to opposite sides of the engine block, the V-configuration engine structure defining:
• a first set of cylinders along a first bank of the engine block and a second set of cylinders along a second bank of the engine block, the first bank and the second bank defining a valley therebetween;
• a first coolant return gallery defined by a first cast passage in the engine block and disposed entirely in the valley and extending in a longitudinal direction from a first longitudinal end of the engine structure to a second longitudinal end of the engine structure;
• a second coolant return gallery defined by a second cast passage in the engine block and disposed entirely in the valley and extending in the longitudinal direction from the first longitudinal end of the engine structure to the second longitudinal end of the engine structure;
• and
• a first cooling jacket associated with the first set of cylinders, the first cooling jacket including a plurality of first cylindrical regions each surrounding one of the first set of cylinders and including a first plurality of first cooling jacket inlets each in communication with the pump outlet on a first side of the plurality of first cylindrical regions and a plurality of first cooling jacket outlets each in communication with the first coolant return gallery on a second side of the plurality of first cylindrical regions opposite the first side of the plurality of first cylindrical regions, the plurality of first cylindrical regions defining a parallel flow arrangement laterally across the engine structure from the pump outlet to the first coolant return gallery;
• a second cooling jacket associated with the second set of cylinders, the second cooling jacket including a plurality of second cylindrical regions each surrounding one of the second set of cylinders and including a second plurality of second cooling jacket inlets each in communication with the pump outlet on a first side of the plurality of second cylindrical regions and a plurality of second cooling jacket outlets each in communication with the second coolant return gallery on a second side of the plurality of second cylindrical regions opposite the first side of the second plurality of cylindrical regions, the plurality of second cylindrical regions defining a parallel flow arrangement laterally across the engine structure from the pump outlet to the second coolant return gallery;
• and
• a radiator supply feed in communication with the first coolant return gallery and the second coolant return gallery configured to provide the coolant fluid to a radiator;
• and
• a radiator bypass feed in communication with the first coolant return gallery, the second coolant return gallery, and the pump inlet, the first coolant return gallery and the second coolant return gallery each forming a radiator bypass passage providing the coolant fluid to the coolant pump and bypassing the radiator during a first operating condition and forming a radiator supply passage providing the coolant fluid to the radiator during a second operating condition;
• wherein the pair of cylinder heads each define a first set of ports in communication with the first set of cylinders and the second set of cylinders, the first set of cylinders including a first cylinder and the first cooling jacket including the plurality of first cylindrical regions defined in the engine block at an outer periphery of the first cylinder and a first port cooling jacket defined in the cylinder head for the first set of ports, the first port cooling jacket including a plurality of first port cooling jacket inlets each in communication with the PUMP outlet on the first side of the plurality of first cylindrical regions and a plurality of first port cooling jacket outlets each in communication with the first coolant return gallery on the second side of the first plurality of cylindrical regions and defining a first head coolant flow path in a parallel flow arrangement with a coolant flow path defined by the plurality of first cylindrical regions.