A camless engine uses actuators to push/pull open the valves, GM experimented with this but has said they weren't going to use it because it had reliability issues or something to that extent.
Mayhap I am overestimating Dod, but tell me what all is involved in shutting down the cylinders, fuel and spark being cut out is all computer controlled, so where in is the complexity, the valves will still open but no fuel will be delivered, and no spark will ignite. Seems simple to me, but I could be overlooking something.
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