My 06 developed that same sound, took it into the dealer and found the cam and flat spotted a lobe. Ended up replacing the cam under warranty.
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1971 Trans Am - Sold
1977 Can Am - Sold
2002 Trans Am Firehawk - Sold
2004 GTO - Sold
2006 GTO - Sold
1970 GTO - Sold
1972 Trans Am - Sold
1970 Trans Am - Current Project
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