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On the passenger side front deck of the block are the two codes associated with the engine. The number in large letters is the application code. It will tell you the year and month it was assembled, and give you a 3 character code which will correspond to a general application type (Mine, for instance, says 1978 police car).
SOME engines also have a smaller number stamped there, the last portion of which is the "unit number" portion of the VIN. My friends 1976 corvette has this. I couldn't tell you why or when it started.
Brian
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