No valves are not self adjusting.
Rowefast, I cannot find any evidence of required valve adjustments on these cars. There was a required valve adjustment on old air cooled VW Beetles. See this below, maybe I'm wrong, can you please cite your sources. This is interesting, see this http://repairpal.com/valve-adjustment-577
I see your point there Mr. Markw. Its like a lot of Fords, just tighten the rocker arm down to the proper torque. Then its up to the lifter to do its job.
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