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A lot of the LSX AL engine does that. It sounded like a small metal tapping sound, very buggish. Don't waste your trip to the dealers. They are bunch of morons, generally when it comes to LSX engine maintainence. I would talk to a local performance shop that had experience with vetts, last generation F-bodies. They would offer much better clue to as what it might be. I personally think it just the way that al engine is put together. Not much you can do about it. One out 4 would have this problem. It doesn't affect the car though.
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