Intake O-Ring Gasket Set GM LS3/LS7

The Intake O-Ring Gasket Set GM LS3/LS7 is a precision sealing component engineered for the Holley LS3 and LS7 rectangular-port intake manifolds on GM LS-series engines. This set of eight rubber O-ring gaskets serves a critical function in preventing coolant and oil leakage at the manifold-to-engine interface. Whether you're rebuilding a high-performance LS engine for street or track duty, or maintaining OEM reliability in a stock application, proper intake sealing is non-negotiable—failure to seal correctly results in coolant loss, air leaks, and potential engine damage.

This gasket set is specifically designed for Holley's rectangular-port intake designs and utilizes durable rubber O-ring construction to accommodate the thermal cycling and pressure variations inherent in modern LS engine operation. The rubber composition resists degradation from coolant additives and engine heat while maintaining a consistent seal across the gasket surface. Each O-ring gasket in the set of eight is pre-sized to match the factory port dimensions on LS3 and LS7 blocks, eliminating guesswork during installation and ensuring proper alignment without over-compression or under-seating—both common causes of gasket failure in high-boost or high-rpm applications.

This gasket set is essential for anyone installing or refreshing a Holley rectangular-port intake on a GM LS3, LS7, or compatible LS-series engine. Technicians and enthusiasts performing top-end refreshes, intake swaps, or turbo/supercharger builds rely on quality O-ring gaskets to eliminate coolant seepage and maintain leak-free operation under sustained boost or high rpm. Installation is straightforward: position each O-ring gasket on the intake manifold port surface before bolting the manifold to the engine block, ensuring even bolt torque to prevent gasket extrusion. Compatible with all GM LS-series platforms using rectangular-port intake geometry.