A valve actuating apparatus for at least two valves of an internal combustion engine having a drive means for rotating at least two camshafts each of which actuate a rocker assembly which in turn actuates said valve. The drive means comprising a drive gear operably rotated by the engine crankshaft and operably engaged with two driven gears each of which is mounted on a respective one of the at least two camshafts. Each of the driven gears are adapted to be slidably moved along their respective camshafts by a servo means.