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

The DS Oil Pump 4-Stage Tri-Lobe LHS w/FP Drive (MOR22378) is a high-performance engine oiling solution engineered for serious engine builders and performance mechanics. This Moroso pump is designed to maintain consistent oil pressure and volume delivery across demanding RPM ranges, making it essential for street performance, racing, and heavily modified engines. Whether you're upgrading a small-block Chevy, Ford 351C, or preparing an engine for sustained high-RPM operation, this pump provides the reliable pressure management that separates quality builds from unreliable ones.

The four-stage tri-lobe rotor design delivers superior oil flow control compared to standard two-stage pumps, reducing cavitation and maintaining stable pressure under extreme acceleration and sustained RPM loads. The left-hand shaft configuration accommodates specific engine block orientations common in vintage and performance platforms, while the integral fuel pump drive allows simultaneous mechanical fuel pump operation without additional mounting hardware. Moroso's precision-engineered internal geometry ensures minimal pressure drop while providing the volumetric efficiency required for tight bearing clearances, aftermarket cam followers, and high-output fuel injection systems.

This pump is ideal for engine blocks requiring LHS (left-hand shaft) configuration, particularly vintage muscle car restorations and period-correct race builds. Compatibility depends on your engine family and mounting surface—verify shaft direction and drive spline configuration before purchase. Installation typically requires professional mechanical expertise to ensure proper timing gear mesh, correct oil pressure relief calibration, and verification of fuel pump operation. The 11.155 lbs unit integrates seamlessly into complete oiling systems when paired with appropriate pan sumps, filters, and pressure regulators.