DS Oil Pump Tri-Lobe 5-Stage LHS Mount

The DS Oil Pump Tri-Lobe 5-Stage LHS Mount from MOROSO is a precision-engineered oil pump built for serious engine builders and performance mechanics who demand reliable, high-volume lubrication under extreme conditions. This left-hand-side mount configuration is engineered for applications where standard oil pump placement conflicts with custom chassis layouts, supercharger installations, or tight engine bay modifications. Whether you're building a competition engine, a high-RPM street machine, or a race-prepared platform, this pump delivers consistent flow across the full operating range without sacrificing packaging flexibility.

The tri-lobe rotor design is the foundation of this pump's effectiveness—three lobes instead of two increase displacement per revolution, translating to higher volume delivery with lower parasitic drag compared to conventional gear-type pumps. The five-stage design means multiple internal chambers optimize flow regulation and pressure consistency across variable engine speeds, preventing cavitation at startup and maintaining steady supply pressure under load. MOROSO's manufacturing standards ensure tight tolerances on rotor clearances, critical for minimizing internal leakage and maximizing pump efficiency. The LHS mount puts the inlet and outlet ports on the left side of the engine, a requirement for many LS platform conversions, big-block Chevys with modified pan designs, and custom fabrications where traditional RHS (right-hand-side) mounting creates interference.

This pump excels in applications including LS engine swaps, Chevrolet big-block builds with custom sumps, fuel-injected restorations, and track-focused vehicles where oil starvation during hard cornering or extended high-RPM use is a real risk. Installation requires correct driveshaft alignment and compatible timing cover—verify your engine's drive method (belt, gear, or direct-drive distributor) before purchasing. The 12.15 lb weight is competitive for a high-displacement pump and won't significantly stress your engine's accessory drive. Proper break-in procedure, quality oil filtration, and regular pressure monitoring ensure years of dependable service from this critical component.