if I had to guess I would say a rocker shit itself and which is common on these cars and has happen to me but not that bad. other then that it maybe in the lower end I would pull the valve covers and check the rockers for damage mine spilt the needle bearings into the pan that is how I found mine.
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2000 SS Procharger
98 Z vert turbo
07 TB SS cai catback and tune
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