Lifters are under the heads
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Lifters are under the heads
It sounds to me like a bent pushrod. I would pull the valve covers and check for a cracked rocker or pushrod problem. Good luck.
05 Gto bent push rod sounds - YouTube
this guy posted later on and said it was in fact a bent pushrod i think this sound identical to the OP video as well as my car now but i still drive it, no misfire codes or any problems