S&S Cycle SS31-6208 High Volume & High Pressure Billet Oil Pump Polished for Big Twin 92-99 style Super Side Winder 4-1/8" Bore EnginesFitment: 1992 '99 HD Big Twin. Features & Benefits: Universial Cover. No thicker than a stock pump. Gears with fewer, but larger teeth provide. Increased oil volume for both supply and return sides of the pump. Supply gears are 9% wider than stock and standard S&S oil pumps. 28% wider than stock return gears ensure proper crankcase scavenging, reduce drag on the flywheels, and eliminate oil carryover. Increased scavenging capacity results in. Less oil