The new designed head replaces the conventional valve train with two rotating spherical valves. They have run a small block ford at over 12,000 rpm with these heads. Since there is no oil in the top of the engine, they claim oil changes of 50,000 miles or more and increases in mileage. This comes from the substantial reduction in rotating friction from the removal of the conventional valve and tappet valve train. http://www.coatesengine.com/videos.html