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Valve stem seals 928 part vs 951 part
I just ordered new valve stem seals, I ordered both the 928 part# in Viton, and the 951 part#, which I don't know what it is.
So what is the difference??? and which to use??
I have read that the ones for the 944NA (928#) work just fine, but no where can I get a clear answer on the difference.
This head only has about 5k on the rebuild (by powerhaus) why did they go so soon?? (haven't pulled it apart yet)
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