Header Gskts Seal-4-Good BBM Rect Port 1.5 x 1.8

The Patriot Exhaust Header Gasket Seal-4-Good BBM Rectangular Port 1.5 x 1.8 (SKU PEP66036) is a multi-layered aluminum exhaust header gasket engineered for Mopar B and RB-series engines. This pair of gaskets provides a critical seal between the exhaust manifold and cylinder head, where thermal cycling and high exhaust pressure demand proven reliability. The Seal-4-Good design delivers superior longevity compared to traditional single-layer gaskets, reducing the risk of exhaust leaks that compromise engine efficiency and increase emissions.

The rectangular port configuration measures 1.5 by 1.8 inches, matching the OEM port geometry of Mopar B/RB-block applications. Multi-layered aluminum construction allows the gasket to withstand sustained exhaust temperatures while maintaining compression and conformability across the manifold-to-head interface. The 1.8-inch port height accommodates both stock and mildly modified manifold designs. Each gasket in the pair is sized and shaped to eliminate fitment issues during installation, reducing potential for blow-by that would otherwise require disassembly and replacement.

This gasket set serves engine builders, restoration specialists, and owners performing exhaust manifold maintenance or upgrades on Mopar muscle cars, classics, and modern retro builds. Whether you're addressing a leaking factory gasket or installing a new aftermarket manifold, the Seal-4-Good formula extends service life and maintains a tight seal across temperature swings. The gasket performs equally well in stock and mildly boosted applications. Sold as a pair to cover both cylinder banks on B and RB-series engines, this product eliminates the need to source individual replacement gaskets separately.