The S&S High Volume High-Pressure (HVHP) billet aluminum oil pump is a new high capacity pump that was designed for the S&S Super Sidewinder Plus Long Block engines. The SSW+ engine features piston cooling jets that spray oil on the underside of the pistons. In order to supply enough oil for these cooling jets in addition to the oil requirements of the rest of the engine, a new pump was needed. Although these HVHP oils are very similar in appearance to the standard S&S billet pumps, there are several important differences. These pumps feature a new tooth profile with fewer, but larger teeth, providing increased oil volume for both supply and return sides of the pump. Supply gears are 9% wider than stock or standard S&S oil pumps to give the HVHP pump even more oil capacity. Return gears are 28% wider than stock or standard S&S pumps to insure that the additional volume of oil supplied to the engine is scavenged and returned to the oil tank, preventing oil carry over from the crankcase breather. In spite of these wider gears, the HVHP pump is no thicker than stock and uses the stock oil pump drive shaft. Pumps are available with your choice of universal or standard style cover. The universal cover provides a number of oil feed and return options allowing maximum flexibility for customized installations, the standard style cover has feed and return holes in the stock 1992 thru 1999 locations. Pump Only Kits fit 1984 thru 1999 Evolution Big Twins and S&S V-Series engines and include supply gears, return gears, drive shaft, drive shaft keys, drive shaft snap rings, check ball, check ball spring, pressure valve, pressure valve spring, cover screws with O-rings, miscellaneous hose fittings, plugs, screws, gaskets, and mounting hardware. Pump, Breather and Gear Kits fit 1984 thru 1986 Evolution Big Twins, S&S V-Series engines and Evolution Big Twins equipped with S&S flywheels and include everything in the Pump Only Kit, with the addition of oil pump drive shaft gear, oil pump pinion shaft gear, and an S&S steel breather gear and shim kit.