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Although this block is upside down, you can still see the extreme size of the cam tunnel. Engineers have figured out that the extreme spring pressures engine builders are running to help maintain high-rpm valve control can actually cause the camshaft to flex along its length. When this happens it throws off the critical valve timing events-when the valves open and close-which hurts power. To stiffen up the valvetrain, the RO7 is cast with an enlarged, and raised, cam tunnel that will accept 60mm camshafts. If you look closely, you'll also notice one big difference between this and the classic small-block: There is no provision for a standard fuel pump.