I’ve got an engine noise I would describe somewhere between a tap and a knock. It is only audible when the engine is warm. It seems to be coming from the intake side of the valve covers between cyl 5-6. It is noticeable down on the exhaust side as well, but not as loud. I’m not sure if it is just “echoing” down that way. It does increase with RPM. Engine otherwise starts and runs fine. No smoking. I thought at first it was an out of spec valve. I did a valve adjustment. I checked all of the valves beforehand and all seemed to be within spec. I went ahead and adjusted all to spec using the kirk tool. Afterwards I noticed no difference in the sound. For what its worth, I changed the oil at the same time. Oil looked great no glitter or metal. I’m wondering if the rocker arm bushing or shaft is worn? I’m kicking myself for not checking that while I was in there. I took two videos. First video is engine cold, just after start up. Second video is after driving, engine oil temp was 180F.
Vid 1:
https://youtube.com/shorts/dj3G4Gqpusk?feature=shared
Vid 2:
https://youtube.com/shorts/a6husDr5nkI?feature=shared