Gonna definitely need to do some testing to find it but those are items to check that could save a lot of back breaking work, I’d also pull the valve covers look for anything w the rockers. Though I think that would be consistent . The fact that this goes away with RPM is interesting .
One posters thought on a fan blade hitting a shroud could be that way . Flex blade flattens out w RPM . I’d start there and flex plate issues including a cracked flex plate all the way around the bolts which I’ve also seen.
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