I had to do a double take when I saw this.

I would love to talk to the UAW member that installed a round head bolt in a LA motor that went into a 73 Charger.
The bolt has the hash tag markings, but is completely round, like turned on a lathe round.
And there are no tool makes on the edges.
My luck, at least it is just a core motor for one of my projects.
The motor appears to have never been apart.

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