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Any chance you can take a video and post it? Sounds like it could be something valvetrain related but ignition and exhaust leak are possibilities also.
Is it there all the time from cold start to normal operating temp?
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97 T/A Ram Air Convt
Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.2 @ 140
'24 Corvette Z06
'17 Sierra 2500HD Dmax
'17 Lex LS460
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