My 1964 CJ5 f-134 has an Intermittent knock, link to video below. I've dropped the oil pan, everything is tight and snug. No metal shavings in the pan, cylinder walls look great. I open the top and side valve cover and again everything look and feels what I would imagine is good. I have reach the limit of my knowledge and hope someone can help me diagnose were the knock is coming from. Anything helps, thanks.

https://www.youtube.com/watch?v=l0H_zQnH8OE