External Oil Pump Two Stage Tri-Lobe RHS GM LS

The External Oil Pump Two Stage Tri-Lobe RHS GM LS from Moroso represents a critical upgrade for serious LS engine builders seeking reliable oil delivery under high-performance conditions. Designed specifically for right-hand-side (RHS) mounting on GM LS platforms, this pump is engineered to maintain consistent oil pressure and flow when factory components fall short of demands imposed by forced induction, high-RPM operation, or extreme duty cycles. Whether you're building a street machine, road-course competitor, or restomod, proper oil circulation directly impacts bearing longevity and overall engine durability.

The two-stage tri-lobe design delivers superior volumetric efficiency compared to traditional single-stage pumps, maintaining aggressive flow curves across the entire RPM band without excessive pressure spikes that can damage seals and gaskets. Tri-lobe gerotor geometry reduces internal slippage and harmonics, resulting in quieter operation and less parasitic drag on crankshaft output. The external mounting configuration eliminates the need for pan-mounted sump units, streamlining installation in tight engine bays and simplifying future service access. Moroso's precision manufacturing ensures tight tolerances and consistent performance batch-to-batch, meeting the exacting standards professional engine builders demand.

LS engine enthusiasts—from bracket racers to twin-turbo road warriors—benefit most from this pump's ability to sustain oil delivery at sustained high RPMs and wide-open throttle scenarios where factory pumps cavitate or lose prime. Installation requires engine-bay fitment verification and compatible drive arrangement, so confirm mounting compatibility with your specific LS variant (Gen III, IV, or IX) and intended drive system before ordering. Pair this with a quality oil cooler and bypass system for complete thermal management, especially in turbocharged or supercharged applications where oil temperatures climb rapidly.