Todd - The “M” is for “Muncie”, 11 = November and “25” = 25th day of November. This all coincides with the previous decoded casting date code info.

The stamped square with a “2” inside is likely to indicate being built on 2nd shift.


~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)