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It’s hard to say Jim….Not being familiar with Elgins, I don’t know how much rod slop is “normal”. It is fairly common for the little OMCs with needle bearing rods to have a slight clunk going over TDC/BDC, especially as they age. How hard is it to pull the gearcase off? You may want to pull the gearcase and rotate it again to rule out gearcase stuff. But, sure kinda sounds like rods if the clunk comes right at TDC/BDC. Could be something hitting under the flywheel like Tubs says, maybe just remove the flywheel and turn it over with a socket wrench.
Does it seem like both rods are “clunking”? Once all this other stuff has been ruled out, I would probably just start it up and see how it sounds. Doesn’t seem likely the both rods/needles are worn/have issues, unless there is rust inside the crankcase….