I just checked the old ad I had here for my engine, and the person you want to look up is named Mark Gillepsie for decoding of those letters (he has a book for that). I think he is in Indiana. He was the jedi master of info on Yenko ZL-1 blocks. The letters decode to an engine number. All letters like yours.
I could be wrong, but 90% sure I am right. Good luck.
-bob
Last edited by black69; 09-08-2023 at 02:10 PM.
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