Made in USA. Melling high performance oil pumps provide dependable performance every time in every application under the toughest RPM conditions. The Melling 10452 high performance oil pump is a standard volume upgrade. The 10452 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 which are included. The relief valve has a pressure threaded plug instead of a cup plug. The oil pump screen o-ring is included. Every Melling high performance oil pump is individually tested for pressure and flow under actual engine operating conditions.