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Def driver side and top at valve cover. I had the truck outside to eliminate any echos in the garage and took a 2" pvc pipe a couple feet long and listened to the valve cover on both sides.... driver's side had the noise.Sounds metalic.
Can you pinpoint a side, top, or bottom?
My 6.4 had a couple of times it sounded like that, went away, hemis are noisy.