206 includes a rocker arm 208 located to move about a pivot 210 a push rod 212 provides a mechanical force against the rocker arm 208 and may include a cup 214 at one end a lash adjustment screw 216 mounted to the rocker arm 208 may in cooperation with the cup 214 provide an adjustable coupling between the push rod 212 and the rocker arm 208 the push rod 212 may be driven by a lifter assembly 218 which in turn may be driven by a cam 220 an electro hydraulic assist actuator 222 may include a plunger assembly 224 for providing a hydraulic force used to vary the open duration of an intake valve 226 more particularly the rocker arm assembly 206 as enabled by the cam 220 may be used to open the intake valve 226 and the electro hydraulic assist actuator 222 may be used to hold the intake valve 226 open for a period of time longer than the cam 220 is designed to do the intake valve 226 includes a valve member 228 controllably movable to provide a fluid opening from an intake manifold 232 to the cylinder 202 by way of an intake passage 230 it is noted that the above description of a variable intake valve system 104 is indicative of a hydraulically enhanced mechanical valve system other types.