Quote:
Originally Posted by Gregski
thanks, I have always been told that they spin?
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If you look at your old heads (882) they have rotators on the exhaust valves. These were meant for smog reasons to help cool the valves from the smog pump. AKA make the valves turn to help create less emissions. If you look at your new heads all the retainers are the same. It was a theory that the valves were rotating always, and while some might move a little, it pretty much stays in one spot. About the only real time you will see a valve move/spin is under valve float condition.