Intake O-Ring Gasket Set GM LS1/LS2/LS6

The Holley Intake O-Ring Gasket Set for GM LS1/LS2/LS6 engines (part number 508-23) is a precision component designed to seal rectangular-port intake manifolds on Late-Model Small Block LS platforms. This set contains eight rubber O-ring gaskets engineered to maintain a watertight seal between the intake manifold and cylinder head ports, preventing coolant and oil leakage that compromises engine reliability and performance.

LS-series engines demand precise gasket geometry to manage the thermal cycling and cylinder pressure loads inherent in modern forced-induction and high-output builds. Holley's O-ring design distributes clamping force evenly across the port opening, reducing the risk of micro-leaks that degrade cooling system integrity and dilute oil with coolant. The rubber compound is formulated to withstand sustained elevated temperatures and resist degradation from ethanol-blend fuels and modern coolant additives. Proper gasket sealing is critical for any LS swap, stroker build, or intake manifold replacement where cylinder head mating surfaces are disturbed.

This gasket set is essential for builders, shops, and enthusiasts performing LS engine assembly, manifold upgrade, or top-end rebuilds. The eight-piece count accommodates the standard rectangular port configuration found on LS1, LS2, and LS6 cylinder heads. Proper installation requires clean, dry mating surfaces and correct torque specification according to the manifold manufacturer's guidelines to ensure consistent sealing without over-compression of the gasket material.

GM LS-series engines are extensively used across performance applications, hot-rod builds, and engine swaps due to their efficiency and aftermarket support. OEM and quality replacement gaskets like this set are foundational components in any LS build specification, whether for street, track, or marine duty where cooling system reliability directly impacts engine longevity and warranty integrity.