When an intake valve sticks you still have a massive internal vacuum leak and huge loss of power. Side valve or not. An engine does not happily run on the other cylinders
Freevalve is default closed. With no camshaft in the mix a valve will be closed unless valve retention is lost. Interference isn't even a concept that applies unless you can somehow fall electronically out of sync
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Too much junk to list. From a 10mpg caddy limo to a 5 speed Saturn
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