DS Oil Pump Stage 5 Tri-Lobe LHS Mount

The DS Oil Pump Stage 5 Tri-Lobe LHS Mount from MOROSO is purpose-built for serious engine builders and high-performance mechanics looking to maximize oil delivery under extreme operating conditions. This left-hand side mounted pump is engineered for applications demanding reliable, high-volume oil circulation—particularly in stroker engines, big-displacement builds, and race applications where stock oiling systems fall short. Whether you're assembling a track-focused LS variant or upgrading a dedicated performance platform, this tri-lobe design addresses the critical need for sustained oil pressure during sustained RPM and load cycles.

MOROSO's Stage 5 designation reflects an advanced tri-lobe rotor geometry that increases displacement and volumetric efficiency compared to standard bi-lobe designs, delivering higher flow rates without proportional speed increases. The tri-lobe configuration reduces parasitic drag by improving fill cycles and minimizing cavitation losses, a critical advantage in tight engine bays where efficiency directly impacts power output and thermal management. The LHS (left-hand side) mounting orientation suits mid-mount and front-drive applications, integrating seamlessly into custom fabrication scenarios where mounting position affects belt routing, accessory clearance, and overall engine architecture. Precision-machined components and tight tolerances ensure consistent performance across extended service intervals.

Professional engine builders, marine platform specialists, and dedicated racers benefit most from this pump's reliable flow characteristics under sustained boost and high-RPM operation. Installation requires baseline mechanical knowledge, proper pump-to-block alignment, and verified drive-train compatibility—factors that vary significantly between platform applications. At 11.85 lbs and measuring 10 x 18 x 8 inches, packaging assessment with your specific block, pan geometry, and accessory configuration is essential before purchase. Consult detailed platform-specific installation guides and oil system schematics to confirm fit and ensure adequate feed-line sizing for optimal performance.