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Re: valve cover oil leak
My 1993 350 was showing oil on the rocker (valve) covers. Replacing the breather grommets (one on each cover) was necessary, however you need to remove the rocker covers if you can't pull them out in one piece. Mine had hardened, so I removed the covers and also replaced the rocker gaskets. The grommets and gaskets are sold separately from GM and are worth the cost from the dealer. Total replacement time for me was @ 3-4 hours because of the disconnects for access and clearance.
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