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Tonight I was cleaning up parts for a rebuild. Parts were: Roller Rockers, Heads (with springs installed), pickup tube, oil pan, windage tray, oil cooler bypass (holley pan).
I found this in the pan when I was cleaning up. I'm 99% it was not in there before I started working.
Color is blue. Top shape is "trapazoid-ish. Bottom is flat. 10MM socket for scale