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I just purchased a 63 model year motor with a December 62 casting date. The starter and alternator are both coded 2 M 28 which by normal GM standards would be the month past December. Does anyone have the magic decoder for Delco date codes?

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Deco Remy date code

I believe that Delco Remy skipped the "I" for the month code to avoid confusion with the number one. Casting numbers on blocks, heads, manifolds, etc. used the letter "I" as a month code. The month code of "M" will be the twelfth letter when the "I" is skipped. Your alternator would decode as Dec. 28, 1962. Hope that helps.
 
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