Sounds like a rod bearing for sure.Get a mechanics stethescope or a long screwdriver and put it on the area where you think the noise is coming from.You will be able to tell between a normal mechanical noise&one that sounds like something is wrong right away.I would start on top&work my way down.Start with the valve cover area to see if its a rocker arm,it could very easily be that too.Good luck and let us know what you find out,pics if you can.
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