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Most of our engines have the rotator at least on the exhaust valve..
but it fits on the intake also... just a matter of taking those parts apart and installing them...
Some of our cars I think have them on both to start with... but they can wear and seldom get replaced or checked... and they cost very little... just like the valve stem seals or new springs... if you have it open it is a cheap great preventative maintenance measure.
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