SteveSS
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On some cars, there are the vehicles' VIN numbers stamped in full or in part onto the block. You can therefore say this engine block came with this car from the factory.
From the book BIG-BLOCK MOPAR ENGINES, it says,
"Another number you'll need is the engine block stamping. This number gives the code for the engine displacement, year and month of production, performance level, and special equipment. The B block or 383 and 400 cid stamping is found on the right side of the block adjacent to the distributor."
So there is no VIN stamped on the block. If the block was dated after the build date for the car you could say it's not correct but if the dates make sense as far as putting things together you could confidently say this is the original block for this car.
From the book BIG-BLOCK MOPAR ENGINES, it says,
"Another number you'll need is the engine block stamping. This number gives the code for the engine displacement, year and month of production, performance level, and special equipment. The B block or 383 and 400 cid stamping is found on the right side of the block adjacent to the distributor."
So there is no VIN stamped on the block. If the block was dated after the build date for the car you could say it's not correct but if the dates make sense as far as putting things together you could confidently say this is the original block for this car.