[Too Many Projects]

Originally Posted by TimG

That is not unlike a factory grind off. Errors were made and I have many original engine pad examples of a factory grind due to errors. They took a big grinder and hit that pad to remove a prior stamp. The marks went left to right on a factory grind. Look for a Tonawanda build with the same code built the same day and the letters and numbers will probably be identical.

These marks aren't a swirl pattern. Did they have an inline belt grinder to leave those long, straight gouges ?
It does seem too obvious for an attempted restamp.