My 300 has a casting mark on right side of block ( passenger ) in the center just below where the head sits. They are 052 then just below that ML. I know what the ML is what is the 052 ?
Ok I think I found out the answer in my manual, engine code number? Now another question what is a engine code number mean ?
Last edited by GrayGhost3480; 07-10-2018 at 04:43 AM. Reason: Incorrect information
Cast numbers are raised, but I think you are referring to stamped numbers, in which case the two letters are the engine production code and the three numbers are a build date code.
Buickman Award 2015
1957 Special 4-door Riviera (hardtop) model 43