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The key to squeezing 572 ci out of a package that’s identical in external size to a 396 is a siamesed-bore Dart Big M block. Smeding punches the holes out to a massive 4.630 inches. When matched with a 4.250-inch stroke, the result is 572 delicious cubes in a standard 9.800-inch deck block. Dart performs most of the machine work prior to shipment, so the only prep work required is boring and honing the cylinders, and align-honing the mains.