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.
74 455 engine ID decoding
- Thread starter kw502bbc
- Start date
Rocketman269V
Member
"34" indicates a 1974 engine block. The "M" & "F" are two different engine plants. I don't know why there would be two on your block.
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