In one embodiment, a retention feature for use in a valvetrain assembly is configured to be attached to a valve bridge and connect the valve bridge with at least one of a rocker arm and a first engine valve of at least two engine valves. The retention feature is further configured to maintain a position of the valve bridge to be aligned with at least two engine valves and resist separation of the valve bridge from at least two engine valves during uncontrolled valve bridge movement. In other embodiments, the valvetrain assembly further includes a mechanical stopper which is disposed on an upper surface of a rocker arm carrier and configured to contact against a lower surface of the rocker arm during uncontrolled valve bridge movement.

In one embodiment, a rocker arm assembly configured for variable valve actuation includes at least one rocker arm, a first valve and a second valve, a valve bridge configured to be actuated by the at least one rocker arm and including a first opening and a second opening for respectively receiving the first valve and the second valve, and a retention assembly at least partially received by the first opening of the valve bridge. The retention assembly includes a push nut and a ring for supporting the push nut. The retention assembly is configured to retain the first valve when the first valve is inserted into the first opening so as to resist separation of the valve bridge from the first valve.