Header Gasket - LS1 Stock Port

The Header Gasket - LS1 Stock Port by FEL-PRO is an OEM-quality exhaust manifold gasket designed specifically for GM LS-series engines running factory-style headers. This gasket seals the critical interface between the exhaust header and cylinder head, preventing exhaust gas leakage that would compromise engine performance and increase underhood noise. Whether you're rebuilding a LS1-powered vehicle, replacing a failed factory gasket, or performing routine engine maintenance, this FEL-PRO component delivers reliable sealing right out of the box.

Engineered with a steel core laminate construction, the Header Gasket - LS1 Stock Port features 1.550 x 1.750 inch rectangular port openings matched precisely to stock LS1 exhaust port geometry. The laminated steel core provides superior sealing integrity under the thermal and pressure cycling that exhaust gaskets endure, resisting blowby and maintaining compression across thousands of heat cycles. FEL-PRO's laminate design allows the gasket to compress uniformly against both the header flange and cylinder head surface, creating a gas-tight seal without requiring exotic resurfacing or additional sealants. This pair covers both cylinder banks, giving you everything needed for a complete header gasket replacement on a dual-exhaust LS1 engine.

LS1 engine owners, restoration shops, and performance rebuilders rely on FEL-PRO gaskets because they maintain factory fitment and sealing standards without premium pricing. Installation is straightforward: simply bolt your headers back in place over the new gaskets using the factory bolt pattern—no modifications to port dimensions or header flanges required. This gasket pair is ideal for vehicles with stock-port LS1 engines; if your headers use oval or modified ports, verify port dimensions before purchasing. Keep a pair on hand for future maintenance or as a reliable backup for your LS swap project.