A camshaft assembly for an internal combustion engine comprising: a hollow outer shaft with slots along a length of the shaft; an inner shaft comprising a bore at an end of the inner shaft and holes along a length of the inner shaft; the inner shaft received within the hollow outer shaft, such that the holes along the length of the inner shaft are aligned with the slots along the length of the hollow outer shaft; a first set of cam lobes fixed to the hollow outer shaft; a second set of cam lobes defining a hole, placed on the hollow outer shaft such that the hole is aligned over the slots on the hollow outer shaft with a clearance fit; a means for fixing the second set of cam lobes to the inner shaft, while simultaneously allowing the second set of cam lobes to be a clearance fit to the hollow outer shaft; and a phaser comprising: a housing with an outer circumference for accepting drive force coupled to the hollow outer shaft; a rotor coaxially located within the housing and fixedly attached to the end of the inner shaft of the camshaft assembly, the housing and the rotor defining at least one vane separating a chamber in the housing, the vane being capable of rotation to shift the relative angular position of the housing and the rotor; and characterized in that the inner shaft is hollow and a control valve is received by the bore at the end of said hollow inner shaft for directing fluid to the chambers. a hollow outer shaft with slots along a length of the shaft; an inner shaft comprising a bore at an end of the inner shaft and holes along a length of the inner shaft; the inner shaft received within the hollow outer shaft, such that the holes along the length of the inner shaft are aligned with the slots along the length of the hollow outer shaft; a first set of cam lobes fixed to the hollow outer shaft; a second set of cam lobes defining a hole, placed on the hollow outer shaft such that the hole is aligned over the slots on the hollow outer shaft with a clearance fit; a means for fixing the second set of cam lobes to the inner shaft, while simultaneously allowing the second set of cam lobes to be a clearance fit to the hollow outer shaft; and a phaser comprising: a housing with an outer circumference for accepting drive force coupled to the hollow outer shaft; a rotor coaxially located within the housing and fixedly attached to the end of the inner shaft of the camshaft assembly, the housing and the rotor defining at least one vane separating a chamber in the housing, the vane being capable of rotation to shift the relative angular position of the housing and the rotor; and characterized in that the inner shaft is hollow and a control valve is received by the bore at the end of said hollow inner shaft for directing fluid to the chambers. a housing with an outer circumference for accepting drive force coupled to the hollow outer shaft; a rotor coaxially located within the housing and fixedly attached to the end of the inner shaft of the camshaft assembly, the housing and the rotor defining at least one vane separating a chamber in the housing, the vane being capable of rotation to shift the relative angular position of the housing and the rotor; and characterized in that the inner shaft is hollow and a control valve is received by the bore at the end of said hollow inner shaft for directing fluid to the chambers.