With universal cover: Several feed & return options; allowing maximum flexibility for customized applications. This S&S High Volume High Pressure (HVHP) oil pump was designed for; and used on all; S&S 4-1/8" bore Super Sidewinder Plus engines. The SSW+ engines are equipped with piston cooling jets that spray oil on the bottom of the pistons. This pump was designed to supply enough oil for the jets; and the rest of the engine. Although the outside is similar to the regular S&S billet pumps; the inside is different. Amongst others wider gears are used. Features include: *New tooth profile on feed & return gears for more volume *9% wider feed gears *28% wider return gears *Same thickness as stock pumps. Stock drive shaft is re-used. Note: This pump kit includes both drive gears & an S&S steel breather valve and shim kit. Note: Drive gears; supplied in this ''Pump Kit''; will fit 84-89 pinion shafts only (models with multiple parts flywheels) and will not fit late OEM 90-99 straight pinion shafts that are one-piece with the flywheels.