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Where is the block number on a ford 351?

The block number on a Ford 351 engine can be found on the passenger side, just below the cylinder head and above the starter motor. It is typically stamped into the engine block and will start with the prefix "D8OE" followed by a seven-digit number. The seventh digit of the number indicates the year the engine was produced. For example, a block number of "D8OE-xxxxxxx-5" would indicate that the engine was produced in 1965.