Engine number question

Gary/IA

Gary/IA

Senior Member
The engine number stamping looks very original. After the "star" are the letters RF and then the number. Does anyone have an explanation for this?
 
I think that is a rebuilder's number. I saw one on a sport coupe by Marietta, MN a few years ago. I know it is for sale, maybe that is the one you are asking about?
 
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