External Oil Pump Single Stage Tri-Lobe RHS GM LS

The External Oil Pump Single Stage Tri-Lobe RHS GM LS from Moroso is purpose-built for LS engine builders and high-performance mechanics seeking reliable oil circulation without belt-drive parasitic loss. This right-hand shaft configuration delivers consistent pump performance across naturally aspirated and forced induction LS platforms, making it essential for serious engine modifications where factory pump capacity falls short. Whether you're building a race engine, upgrading cooling efficiency, or preparing for forced induction, this external pump design provides the flexibility and reliability that separates professional builds from amateur installations.

Moroso's tri-lobe rotor design maximizes volumetric efficiency while maintaining low noise operation—a critical advantage when running tight tolerances in modern LS builds. The single-stage configuration means minimal complexity and superior reliability compared to multi-stage alternatives, with the right-hand shaft orientation accommodating standard LS block configurations and aftermarket mounting solutions. External mounting eliminates interior engine bay congestion, improves serviceability, and allows customization of pump displacement and pressure regulation to match your specific build requirements. The compact 7 x 8 x 7 inch footprint (weighing just 5.15 lbs) makes packaging straightforward even in tight engine compartments.

Professional LS builders, turbo and supercharger installers, and street/strip enthusiasts rely on this pump when factory oil delivery won't sustain higher RPM ranges or increased bearing loads. Installation typically pairs with custom dry-sump or remote-mounted oil system configurations, giving you precise control over pressure and flow rates. Verify shaft orientation (RHS designation) compatibility with your block and pan setup before purchase; this pump is most commonly used in dedicated performance applications where every component choice reflects intentional engineering rather than cost-cutting compromise.