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We used a Dart Big M block because it is cast out of Class-32 high nickel iron, has four-bolt ductile iron main caps and a bore range of 4.250 to 4.625 inches. As we stated last month, the coolest feature of the block, in our eyes, is the redesigned oiling system. Instead of oiling the cam first like the stock blocks, Dart reconfigured all the oil passages and sends it to the crank first, then up to the top end. This keeps the most critical part of the engine-the mains and rods, supplied with oil.