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Dart's high-nickel-content SHP iron-blocks are cast in Wisconsin and machined on ultra-modern hardware in one of the company's two Detroit-area facilities. For 427 cubes, the bore is 4.125 with a 4.000-inch stroke (though the SHP block is said to support combos up to a maximum of 4.185 x 4.250). Bores are Siamesed for rigidity, while the distinctive scalloped outer-jacket shape provides plenty of coolant flow around the cylinders. Decks have a minimum of 0.675-inch thickness.