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The block comes from Mopar Performance and carries PN P5007552. "It's a replacement block (most people call it the 'resto' block.) It uses stock 340 specifications on the main size and deck height along with the 59-degree lifter bores, but it's much stronger than the stock block. It has thicker decks and main webbing, four-bolt main bearing caps, and most importantly, thicker cylinder walls."