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Notice how the crankcase volume is divided equally by the main journal webbing on the RO7 block. Because this is a dry-sump engine, this design is important because it helps equalize the amount of vacuum pulling on the underside of each piston. In this photo, you can also see the provisions for piston oilers built right into the casting. Each piston gets two oilers so that the cooling effect of the oil will be approximately the same on both sides of the pin. Finally, the steel main caps use four parallel studs and aren't splayed like classic small blocks with four-bolt main caps. This block was designed specifically to use four-bolt mains, and straightening the holes probably creates room in the block for other things-like the galleries for those pin oilers.