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Re: Valve stem seal install for 292 inline 6 - cup style
Correct. They rotate the exhaust valve to reduce burning.
They are heavy, and are often removed in a performance application, but sometimes GM has used different height springs to account for the rotator thickness, or deeper spring seats in the head to account for the rotator thickness.
For a street vehicle, I'd leave them in (though I removed them on my daily).
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