Melling Engine Oil Pump for GM LS-Series Engines — 7/8" Inlet, High-Volume High-Pressure Upgrade

Melling's high-volume, high-pressure internal wet-sump engine oil pump for GM LS-series engines delivers increased flow and reliable oiling using a 7/8" inlet for easier pickup and compatibility.

This replacement oil pump is built for GM LS-family engines and designed to provide higher oil volume and pressure than many stock units. It's an internal wet-sump style pump with a 7/8-inch inlet, supplied individually and sized to fit common LS applications. The unit ships in a compact package (approx. 8.03 x 5.98 x 5.28 inches) and weighs about 2.78 pounds, making installation and handling straightforward for professionals and experienced enthusiasts.

How does this pump improve oil delivery compared with a stock pump?

The Melling high-volume, high-pressure design increases oil flow and maintains better system pressure under load, which helps ensure consistent circulation to bearings and valvetrain components. It is tuned for the LS-series platform to provide stronger performance where the OEM pump may be marginal at high RPM or modified builds.

• Higher internal displacement for increased oil volume.
• Elevated pressure characteristics to resist drop-off at high engine speeds.
• 7/8" inlet improves pickup efficiency and compatibility with common sumps.

Will this pump fit my GM LS engine and how is it installed?

This pump is designed for GM LS-series engines that accept internal wet-sump pumps; verify fitment for your specific block and year before ordering. Installation follows standard LS oil pump replacement procedures—remove oil pan and timing cover as required, align the pump to the crank snout, and torque fasteners to OEM specs.

• Internal wet-sump style: fits typical LS pump locations.
• Single-item package for one pump; confirm inlet and mounting match your engine.
• Recommended for experienced DIYers or professional installation to ensure proper timing and sealing.

What materials, dimensions, and packaging should I expect?

The pump arrives packaged individually with compact dimensions and a manageable weight for shipping and handling. Melling builds its pumps to automotive-grade tolerances for durability under normal and performance conditions; check compatibility notes for any clearance or modification needs before fitting.

• Item package dimensions: approximately 8.03 x 5.98 x 5.28 inches.
• Package weight: about 2.78 pounds for a single pump.
• Product type: automotive replacement part engineered for LS-series engines.

Who is this for: Owners and builders of GM LS-series engines who need a robust replacement or upgrade to the factory oil pump—especially those running higher RPMs, mild performance upgrades, or wanting more consistent oil pressure under load. This Melling pump suits professional mechanics, engine shops, and experienced enthusiasts who will confirm block compatibility and follow proper installation procedures. It is supplied as a single pump unit and is intended as an OEM-style internal wet-sump replacement with improved flow and pressure characteristics.