That does look like a piece that would be in the crankcase and a wear well lubed wear mark on it.
Good eye GIM! (Short for “gmc-is-me”)

Don

Last edited by 2-Ton; 01/16/2021 10:04 PM.

1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!