Abstract: A radiator assembly for a cooling system on an internal combustion engine includes a radiator core having a plurality of tube-flow passages for transferring heat from fluid coolant to ambient atmosphere and at least one tank in fluid communication between an internal combustion engine and the radiator core. The radiator core includes a header flange extending about at least a portion of a perimeter of the radiator core and the tank includes a clamping flange extending about at least a portion of a perimeter of the tank corresponding to and in adjacent relationship with the header flange of the radiator core.