LS1 Exh/Int Guide .3138 OD .502 .2.000 OAL

The LS1 Exh/Int Guide .3138 OD .502 .2.000 OAL from FERREA is a precision valve guide designed for high-performance LS1 engine builds and race applications. This critical internal component ensures proper valve stem alignment and clearance within the cylinder head, making it essential for mechanics working on LS powerplants.

Engineered with a .3138-inch outside diameter and a .502-inch bore specification, this guide has a 2.000-inch overall length that fits LS1 cylinder head architecture precisely. Constructed from premium bronze alloy material, it withstands high valve-lift profiles and elevated combustion temperatures, ensuring durability and performance. The tight dimensional control of the guide promotes consistent oil flow to the valve stem while maintaining the necessary clearance for both intake and exhaust valves.

LS1 enthusiasts undertaking cylinder head work will find that proper valve guide selection is crucial for valve sealing, longevity, and combustion integrity. Installation requires precise boring and honing of the cylinder head guide bosses, and guides must be pressed in cold using appropriate tooling to avoid distortion and guarantee perpendicularity. This product is ideal for those rebuilding a stock LS1 or preparing an engine for boost.