DS Oil Pump 4-Stage Tri-Lobe LHS w/FP Drive

The DS Oil Pump 4-Stage Tri-Lobe LHS w/FP Drive (MOR22378) by Moroso is a high-performance engine oiling solution engineered for serious engine builders and performance enthusiasts who demand reliable, consistent oil delivery under extreme operating conditions. This left-hand inlet pump is specifically designed for applications requiring fuel pump drive capability, making it ideal for vintage muscle cars, street rods, and custom engine builds where traditional OEM pump designs fall short. Whether you're rebuilding a classic big-block or maximizing flow in a supercharged platform, this pump delivers the volume and pressure stability needed for sustained high-RPM operation.

The four-stage tri-lobe rotor design significantly increases oil displacement compared to conventional two or three-lobe configurations, translating to superior volume at any given RPM while maintaining tight tolerances for minimal internal leakage. The tri-lobe geometry optimizes pressure rise characteristics, reducing shock loads on bearings and extending component lifespan during aggressive driving or racing scenarios. The integrated fuel pump drive provision allows you to eliminate external belt-driven fuel systems, streamlining your engine bay layout while maintaining full fuel system independence from the belt tension or serpentine system dynamics. This pump's robust construction and precision-machined internals ensure stable oil pressure across the entire RPM band—critical for protecting your investment during high-load situations.

Left-hand inlet configuration makes this pump compatible with block designs where the pickup tube enters from the driver's side, common in many small-block and big-block Chevy applications, Ford FE and big-block engines, and various vintage racing platforms. Installation requires proper timing with your engine's camshaft—alignment with the drive lobe is essential to prevent cavitation and ensure maximum efficiency from first start. The 11.155-pound unit integrates seamlessly into custom oil systems and high-flow applications where OEM pumps struggle to maintain adequate pressure above 6,500 RPM. Professional installation and verification of relief valve settings are recommended to optimize performance for your specific displacement, compression ratio, and intended duty cycle.