I suppose they could beat up the valve stem tips and the rockers could be slapping on the cam/lobes...but I think you'll mostly just experience some loss in power as the valves won't fully open for a full charge of fuel/air or exhaust. Of course the longer you run it that way the more the problem can compound.
1987 Montero 2.6l 5-speed (Sold...but I still miss her)
2008 Jeep Patriot Sport 4x4
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