Oil Galley Plug GM LS Gen III/IV 08-19

The Melling Oil Galley Plug for GM LS Generation III/IV engines (2008–2019) is a precision press-in component designed to seal critical oil passages within the engine block. This white plastic plug with integral O-ring serves as a factory-specification replacement part for LS-series engines, ensuring proper oil gallery containment and preventing unwanted fluid bypass during engine operation.

The O-ring sealed design creates a dependable hydraulic barrier at the gallery junction point, critical for maintaining correct oil pressure distribution throughout the LS engine's lubrication circuit. Melling manufactures this component to OEM specifications, matching the factory plug's geometry and material composition. The press-in installation method requires careful alignment during assembly to avoid damage to the plastic body or O-ring seal. Proper sealing at the oil gallery is essential for engine longevity; a compromised plug can result in pressure loss, inadequate bearing lubrication, and accelerated wear.

This replacement plug is ideal for engine builders, machine shops, and enthusiasts performing LS engine assembly or rebuilds. Whether restoring a stock engine, constructing a performance build, or repairing a damaged gallery plug, this Melling part delivers OEM-level reliability. The compact 1.55 x 1.55 x 3.5-inch profile fits the standard gallery bore without modification. LS engine owners and shops rely on Melling components because they integrate seamlessly into the engine block's original design without requiring custom machining or supplementary sealing compounds.