Impala Tech - View Single Post - Valve Appearance - 496 BBC
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post #9 of (permalink) Old 01-13-2020, 05:57 PM
Big Dave
Join Date: Jan 2006
Posts: 12,751
Those are Fel-Pro valve stem seals. Made of rubber instead of plastic but should last for 70K miles at least.

Don't know whose heads those are but even new heads require work as opposed to bolting them on. This is one of about nine videos on machining a head that illustrates my point:

Big Dave
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