400-455 Pontiac Exhaust PORT SIZE 1.88in DIA

The FEL-PRO 400-455 Pontiac Exhaust Port Size 1.88in Diameter gasket (Part #1436) is a precision-engineered exhaust header manifold gasket designed for Pontiac V8 engines. This steel core laminate gasket delivers the critical seal required between the cylinder head and exhaust manifold, preventing exhaust leaks that degrade engine performance and fuel economy. The 1.880-inch round port design ensures proper fitment on the 400, 421, 428, and 455 Pontiac big-block engines commonly found in performance vehicles and classic restorations.

Constructed with a steel core laminate construction, this gasket withstands the extreme temperatures and pressure cycles that occur during exhaust gas flow. The laminate design provides superior crush strength and recovery compared to composite gaskets, maintaining a consistent seal across the port interface even under sustained high-RPM operation. FEL-PRO's manufacturing tolerances ensure the gasket seals flush with the manifold surface, reducing turbulence and exhaust bypass. Each order includes a pair of gaskets—one for each cylinder bank on V8 applications.

This gasket is essential for anyone rebuilding a Pontiac V8 engine, replacing a leaking or failed manifold seal, or installing aftermarket headers on a classic or muscle car platform. Proper exhaust sealing is critical to engine efficiency, preventing hot gases from escaping into the engine bay and ensuring all combustion byproducts exit through the exhaust system as intended. The FEL-PRO 1436 is the OEM-specification replacement gasket trusted by engine builders and restoration shops for Pontiac big-block applications.