I believe your idea that "M" represents December is incorrect. Months are represented by the letters A-L as indicated by the chevellstuff site that Joe linked to above. Tim Lederman's website gives a clear example of the letter "I" being used in a date code disproving the idea that "I" was not used in the A-L month code. http://www.1954advance-design.com/Web%20images/casting-code-photos/codes-ser-nums.html. What is "M38"? Don't know. Good luck with your build.


"Nothing astonishes men so much as common sense and plain dealing." - Ralph Waldo Emerson