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Message: [QUOTE="Woodnthings, post: 287725, member: 5721"] Fluorocarbon (Viton®) o-rings have an [URL="http://www.oringsusa.com/html/shelf_life.html"]unlimited shelf life[/URL]. The materials used in fabricating o-rings varies and that can lead to them lasting or not. If you are worried about them degrading you should also worry about the ones in the pedestal and turbo flanges. Those are standard AS568 Viton o-rings and they can fail too. Any seal has the opportunity to degrade over time, even the RTV That is used to seal the OEM or aftermarket plenums can and does breakdown over time. I was pretty shocked at how easy my plenums were to remove with very little surface cleaning required on the head when I installed billet plenums. O-rings are normally used anywhere there is a machined part interface where the part fits as close to perfect as it can. RTV is normally used where you have inferior part interface, like the OEM plenums, oil pans and such. Stamped steel does not provide the near perfect surface that machined parts do. Neither does cast aluminum unless it is machined afterwards. That is the biggest reason that o-rings can be used in this application over RTV that makes a mess. If you are a die-hard RTV fan, you could always remove the o-ring and then the o-ring groove machined into the plenum would make a nice channel for the RTV to squeeze into making a good seal too. [/QUOTE]

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