Ticking noise, 383, can't locate the source

I take it, egg shaped, means where the shaft goes thru it.

They all appear to have holes slightly larger than the shaft. I put a small led light on the top of each and I see the same sliver of light shine between the rocker and shaft.
A primitive way of trying to determine the problem.

I wish I had some spare rockers or valve cover to cut the top off.

#7 definitely has more side to side play, but I don't see the reason.