What are Intake and Exhaust Centerlines?
The centerline of either the intake or exhaust lobe is the theoretical maximum lift point of the lobe in relationship to Top Dead Center in degrees of crankshaft rotation. (They are shown at the bottom of the camshaft specification card as “MAX LIFT.”) The centerline of the cam can be moved by installing the camshaft in the engine to an advanced or a retarded position.
