Real reason for the X on the X heads

Cuda68Scott said

That is pretty is really a neat story, I have no doubt that your father recollects that correctly. I am often amazed at my elderly father's clear memory of his work days.

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Back then he was really sharp and really still is. I just talked to him and he doesn't remember about the J and other letters, he said that it could of been after he went to another department but clearly remembers about the X heads. Like I said. He could care less about cars it was all in a days work for him