Melling oil pumps provide dependable performance every time in every application. Every pump is engineered, manufactured and assembled to the highest material and production standards. Manufacturing processes include state of the art CNC machines and the latest phosphate coating processes.Features: Standard volume performance upgrade of the M342 The 10342 features a hardcoat anodized body with a cast iron phosphate coated cover for improved pump performance and durability. Adjustable by-pass pressure using optional springs. The cup plugs have been replaced with threaded fittings. Uses 1" bolt on pickup tube. Included Springs:  Installed Standard Pressure Yellow 50psi relief spring for 5.7L  Plus 15psi Purple 65psi relief spring for 6.1L Plus 10psi Red 60psi relief spring  O-Ring for pickup tube Applications: 2003-2008 5.7L Gen 3 HEMI 2005-2010 6.1L Gen 3 HEMI