LS1/LS6 Intake Manifold Gasket

The FEL-PRO LS1/LS6 Intake Manifold Gasket (Part No. 1312-3) is a precision-engineered composite gasket designed for General Motors LS-series engine platforms. This gasket seals the intake manifold to the cylinder head with a 0.06-inch thickness and features cathedral-port geometry (1.19 x 3.34 inches) optimized for the airflow characteristics of LS1 and LS6 engines. Sold as a pair, this product is essential for maintaining proper intake manifold sealing during engine assembly, rebuilds, or gasket replacement operations.

FEL-PRO gaskets are manufactured to exacting tolerances and use composite materials engineered to withstand the thermal cycling and pressure differentials common in high-performance engine environments. The cathedral-port design matches the specific intake manifold geometry of LS1 and LS6 applications, ensuring proper sealing surfaces and minimal compression losses. The 0.06-inch thickness is calibrated for factory intake manifold specifications on these platforms. This gasket set is suitable for both stock and modified LS-series engines, provided the intake manifold itself remains within OEM specifications.

Technicians and engine builders working with LS1 (5.7L, naturally aspirated) or LS6 (7.0L, naturally aspirated) powerplants will recognize FEL-PRO as an industry-standard choice for intake gasket replacement. Whether performing routine maintenance, addressing intake leaks, or executing a complete engine rebuild, this gasket pair ensures reliable sealing performance. The composite construction resists fuel permeation and maintains gasket integrity across repeated thermal cycles typical of street and performance applications.

LS-series engines are foundational to performance applications across Chevrolet, GMC, and third-party platforms. Proper intake manifold sealing is critical to prevent vacuum leaks, fuel contamination, and coolant bypass. The FEL-PRO 1312-3 is engineered to maintain OEM-specification sealing pressure and thermal stability, making it a trusted choice for rebuilders and technicians who depend on proven gasket performance.