Have you had this engine apart?
1st thing that comes to mind...
Cam end play not properly shimmed as in to loose?
Take a long screwdriver and hold it tight to your ear and place the end on the engine. May help to ear plug the other ear while doing this.
Try it on the cam side, front and back, may help to locate where the noise is coming from.
BTW, I'm in the same hearing boat as you.
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