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In traditional engines (not overhead cam), the camshaft pushes lifters UP. Lifters push the pushrods UP, but the valves need to be pushed DOWN... so the rocker arm "rocks" on a shaft that pushes one side down when the other side goes up.
It's not a difficult job. Rocker arms aren't doing the most stressful job in the engine, but they do eventually wear out.
Part of the problem is, Engineers attempt to make the rocker arms s light as possible so they can move back when the camshaft/lifter/push rod relaxes. The weight of the valve train (all those components PLUS the weight of the valves) tend to contribute to valve "float", that's when the spring can't push that mass of material back fast enough when the engine is operating at high RPM.
Since the valve train has deliberately been kept "lightweight", they tend to wear. That's one of the reasons for an overhead cam in an engine. You do away with the push rod and rocker.
Lou Altenwerth
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