Intake Port Seals (8pk) LS3/LSXr

The FAST Electronics Intake Port Seals 8-pack for LS3/LSXr intake manifolds are precision rubber gasket components engineered to seal the intake port interface on F.A.S.T. LS3 and LSXr intake manifold systems. Each rectangular port seal measures 1.542 x 2.982 inches and is manufactured to maintain consistent compression and prevent vacuum leaks at the manifold-to-cylinder head junction—a critical seal point where manifold gasket failure directly impacts idle quality, drivability, and fuel mixture control.

This eight-pack configuration provides a complete set for a V8 engine block, with each seal produced from durable rubber compound formulated for the temperature cycling and chemical exposure of the intake manifold environment. The intake port seal design accommodates the specific port geometry of LS3 and LSXr platforms, where proper sealing prevents outside air from entering the intake tract and maintains the precision of fuel-air metering. Degraded or missing seals result in rough idle, lean-running conditions, and diagnostic trouble codes related to air-fuel ratio variance.

These seals are essential for engine builders, performance technicians, and shop professionals performing LS3/LSXr manifold installation, refresh, or troubleshooting. Whether you're installing a new F.A.S.T. intake manifold on a stroker build, replacing worn seals during manifold removal for gasket service, or commissioning a crate engine installation, this eight-piece set ensures all eight intake ports are sealed to factory specification. The rectangular port format is specific to the F.A.S.T. design geometry and is not interchangeable with other manifold manufacturers' seals.