Where do I find the size

My hubby has a Cleveland motor, but he does not know what size it is. It has DC and some no;'s stamped on it. Any Clues as to what it means and where the size is stamped?

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a ture 351 clevand has "small block" bolt up at transmission is 5 1/4 inches accrossed top tranny holes and thermostat bolt to block not intake

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