External Oil Pump Two Stage Tri-Lobe RHS GM LS

The External Oil Pump Two Stage Tri-Lobe RHS GM LS from Moroso is engineered for serious LS engine builders who demand reliable oil delivery under extreme performance conditions. This right-hand-side mounted external pump addresses a critical requirement in high-rpm, boost-heavy, and engine conversion applications where factory internal pump capacity falls short. Whether you're building a stroker, turbo, or supercharged LS platform, this pump ensures consistent oil pressure and volume to protect bearing surfaces and reduce catastrophic failure risk during dyno runs and street duty.

Moroso's two-stage tri-lobe design delivers superior flow characteristics compared to conventional gear-driven alternatives, with reduced pulsation and mechanical noise. The tri-lobe rotor geometry minimizes internal leakage while generating consistent displacement across the entire rpm range, making it ideal for motors hitting 7,000+ rpm or operating under sustained boost pressure. This external configuration eliminates dependency on block-mounted pump limitations and allows precision oil routing to critical galleries, coolers, and remote filter housings. The RHS (right-hand-side) mounting orientation suits common front-engine, rear-drive LS installations where crankshaft accessibility is standard.

This pump is the preferred choice for race teams, engine shops, and enthusiasts completing LS swaps in vintage muscle cars, hot rods, and purpose-built competition vehicles. Installation requires custom bracket fabrication and oil line plumbing but rewards builders with redundancy, modularity, and the ability to match pump displacement precisely to engine demand. The compact dimensions and 7.95 lb weight minimize parasitic loss while maintaining adequate displacement for applications ranging from 350 hp street builds to 900+ hp forced-induction platforms. Verify RHS rotation compatibility with your specific block and accessory drive configuration before purchase.