Also some of the later blocks have the size of the motor shown in liters. There are sometimes other individual letters found on blocks like “GM” or “CFD” for the Central Foundry Division, but they are not part of the block casting number. The block casting numbers do not have any letters in them. The number itself can have 6, 7 or 8 numeral digits. Some of the later model blocks have the casting number on the passenger side of this ledge. This ledge is below the deck of the block and the ledge forms the mating surface between the block and the transmission bellhousing. The block casting number on smallblock and big block Chevy V-8 motors is located on a ledge found at the rear of the block, most often on the driver's side.
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