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The block itself is Dart’s SHP block that’s been punched out to a 4.155-inch bore with four-bolt ductile iron main caps on the center three and two-bolt caps on the end. The bottom end features all forged internals, including a 4-inch 4340 crankshaft, 6-inch 4340 rods with ARP 2000 rod bolts, and 10:1 compression pistons. Pretty stout, right? And it’s more than capable of handling big power.