These aluminum 4-Lobe dry sump oil pumps have been developed with their decades of oiling system expertise to provide you with a lighter, better performing design that will save weight and make more crankcase vacuum. They feature 4-lobe aluminum scavenge sections with individual timing gears to ensure proper clearance at the highest rpm. The pumps use a spur gear pressure section based on a highly successful billet wet sump pump design, and variable spring rates optimize your oil pressure for smooth, reliable oil pressure readings. The Speedmaster 4 lobe dry sump oil pumps have multiple -16 AN scavenge outlet options for increased flow back to your dry sump tank. They weigh about half as much as gerotor pumps and take up to 40 percent less power to drive!