Exhaust Gasket

The FEL-PRO exhaust gasket (MPN 1479) is a critical sealing component designed for big block Buick engines with rectangular-port exhaust headers or manifolds. This gasket prevents exhaust gases from escaping between the header flange and cylinder head, maintaining combustion efficiency and preventing costly air leaks that degrade performance and fuel economy. Mechanics and engine builders trust FEL-PRO gaskets as OEM-equivalent replacements for both stock restoration and modified engine builds.

This exhaust header gasket features a steel core laminate construction, which provides superior heat resistance and durability compared to soft gasket materials alone. The steel core reinforces the gasket under the extreme thermal cycling and pressure cycles typical of exhaust ports, where temperatures regularly exceed 1,200°F. The rectangular port dimensions (1.260 x 1.940 inches) are precisely engineered to match big block Buick port geometry, ensuring a perfect seal without overhang or compression loss. The pair configuration means you receive two gaskets—one per side—allowing complete manifold or header replacement in a single service interval.

Technicians replacing OEM cast-iron manifolds with tubular or performance headers will find this gasket essential for maintaining a leak-free seal and avoiding repeat disassembly. This product is ideal for big block Buick engines in muscle cars, hot rods, and vintage performance applications where reliability and authenticity matter. Installation is straightforward: clean mating surfaces thoroughly, position the gasket on the cylinder head ports, align the header flange, and torque fasteners in a star pattern to manufacturer specifications. Proper gasket sealing prevents exhaust resonance, reduces emissions bypass, and maximizes dyno-proven power delivery.