74 455 engine ID decoding


New member
Jan 15, 2020
East Tennessee
Hello. I have a 74 455 Olds in my 79 Trans Am that I am rebuilding. It replaced the 403 in 83, by a previous owner, so I don't know which car it came from. It has two numbers stamped on the pad. The top number is 34M220629. The bottom number is 34F158993. Anyone know the info on the codes? Thanks in advance.

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