The number stamped on the front of my 340 is FW340P29290044 (photo). The cast date code is 5-28-69, so I suppose this engine could have been issued to a 1970 car. The passenger side along the oil pan rail is stamped with 0B181130. Some internet people say these 8 digits are the last numbers of the original VIN, but I'm no expert. I pulled this engine from my 1971 Demon 340, 4 speed. Someone on this forum probably knows more about these numbering schemes.
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