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Post a vid clip if you can. Are you sure its coming from the passenger side?
It could be a small exhaust leak or even a spark plug slightly backed out.
A bad lifter is very loud and distinguishable and that doesnt sound like your problem.
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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