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No way is a 3970010 block correct for 9N637177 and 637xxx range. NOM for sure!Bryan
Is Darrell learning a new language...that I'm tentatively calling 'photo communicado'... That particular VIN (637177)would probably be from 'Mayday'... (or the 11th week of April?).. PS. What is the earliest known 3970010 block use??
First 010 blocks appeared before this car was assembled, first casting date of an 010 block is in the third week of April, both 010 and 618 were in use by the first week of May most were 618s but there are a few 010s intermixed at this time.