Take it from a guy that had this happen, don't drive it until you figure out what is making the noise. Mine was a chain ramp, this is not my thread....
http://forums.pelicanparts.com/porsche-911-technical-forum/669969-how-plastic-chain-ramp-can-ruin-your-engine.html
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72 911
Although it is done at the moment, it will never be finished.
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