Melling high performance oil pumps provide dependable performance every time in every application under the toughest RPM conditions. The Melling 10342 high performance oil pump is a standard volume upgrade of the M342. The 10342 features an anodized hard coated aluminum body and cast iron phosphate coated cover for improved pump performance and durability. Adjustable by pass pressure using optional springs. The relief valve has a pressure adjustable screw in plug instead of a cup plug. The oil pump screen mounting seal is included. Every Melling high performance oil pump is individually tested for pressure and flow under actual engine operating conditions.