Quote:
Originally Posted by Synchro909
The tappet and cam follower are the same thing on a side valve motor. The cam follower rotates to avoid the flat face which contacts the camshaft suffering undue wear. Without rotation, it would quite quickly develop a groove where the cam presses. The rotating tappet also causes the valve to rotate, thus keeping wear at the valve seat uniform.
Hope that helps.
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Thanks for the info. I kinda thought the valve would rotate also for seat wear. But I really couldn't see any of the valves rotate while turning engine over. You could see them maybe try but they moved very little.