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The A351 Sportsman block is no longer available unless you can find a dealer with an unsold one.
The replacement is the D351 Amateur Competition Block. It is also known as the 351 Ford Racing Truck Block and is listed (again) in the Sportsman Engine Parts of the Ford Racing Performance Parts catalog.
The D351 is a remanufactured production block with a 4.030 bore, 2-bolt nodular iron bearing caps. 190 lbs. Can be stroked to 427 cu. Recommended max HP is 500.
As an interesting note, the A351 block is being used the the 392 stroker short block and 392 stroker long block offerings from Ford.
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