It looks like a piston stop mark but why would you use a set screw that is pointy to dig a hole in the piston two holes instead of one? You figure one is a Goof but two!To all the money you spent on that engine build, everything should be spotless. It looks like you are finding stuff that is usually fine turns out bad. I hope this is the last bad thing you will find on it. I would remove the rods, crank and inspect the bearings if I were you. I would strip that block and inspect everything before putting it in your car. Goodluck on your build, looking forward of a happy ending.
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