Engine build date

3723872 is not found in the factory database.... and the ancient North American paper records are not showing an exact build date for that serial number, either.

They do indicate that Model 277 engines just a few numbers higher and a few numbers lower were all received between May and August of 1990. So I would surmise that 3723872 was most likely produced in the first half of 1990... And I also see a note here indicating that 3723872 was a Model "277G" 

Thanks for the fast response!  What does the G stand for in "277G"