"CAM CENTERLINE is another term which is critical in defining camshafts. Cam centerline refers to the actual cam phasing or timing with relation to the crankshaft. Specifically, where the actual centerline of the #1 cylinder intake lobe is in relation to the #1 piston, defined in degrees of crank rotation AFTER TOP CENTER. It is one of the methods of defining cam "degreeing"".
"CAM LOBE SEPERATION is used to define the actual spacing of the intake and exhaust lobes from each other, for the same cylinder. It is a fixed amout, ground into the shaft at the time of manufacture".