Rex,
The RMC could be Renolds Massena Casting. Since these were like service parts the early castings would be hand stamped, M2 I'm not sure about may be a date code or mold number. If I remember correctly the Dunns Number stood for Dunn&Bradstreet. This had to do with billing, quality and parts tracking. (inventory control) Back in the day much was shipped by rail and you had to track orders of parts. More than one vendor could make the same part, that's how we could tell the difference. The loading docks used to get very busy. Renolds is now Alcoa. I don't know if the Massena foundry is still there or not. Somebody that worked there would be a help. If run across an old material guy that I worked with. I will ask him if the list of old vendor dunns numbers are available anywhere. It may explain a few of them on the casting. (numbers) Other than the GM Engineering part number. If you look at the block the other guy posted, it's a later block(plug) most of the numbers you have are cast into it except for the Saginaw foundry stamp.
Dave
The RMC could be Renolds Massena Casting. Since these were like service parts the early castings would be hand stamped, M2 I'm not sure about may be a date code or mold number. If I remember correctly the Dunns Number stood for Dunn&Bradstreet. This had to do with billing, quality and parts tracking. (inventory control) Back in the day much was shipped by rail and you had to track orders of parts. More than one vendor could make the same part, that's how we could tell the difference. The loading docks used to get very busy. Renolds is now Alcoa. I don't know if the Massena foundry is still there or not. Somebody that worked there would be a help. If run across an old material guy that I worked with. I will ask him if the list of old vendor dunns numbers are available anywhere. It may explain a few of them on the casting. (numbers) Other than the GM Engineering part number. If you look at the block the other guy posted, it's a later block(plug) most of the numbers you have are cast into it except for the Saginaw foundry stamp.
Dave
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