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This would enable the engine to be easily switched between 4 and 2 cylinders while running. It would also go beyond just turning the cylinder off so it doesn't use the fuel, but also eliminate much of the pumping loss. Crank an engine over by hand with no rocker arms on it. We did it many time on an engine stand while assembling a rebuild, get up to 12 to 1 compression and even a 3' breaker bar was a struggle to turn over.
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