Exhaust Gaskets SBM 318-360 Square End Ports

The Exhaust Gaskets SBM 318-360 Square End Ports by Remflex Exhaust Gaskets are engineered to seal the critical interface between your cylinder head and exhaust manifold on small-block Mopar engines. Whether you're rebuilding a classic muscle car, restoring a vintage Dodge or Plymouth, or upgrading a performance street machine, these gaskets eliminate exhaust leaks that rob power and create noise. Square end port geometry demands precision-matched gaskets, and Remflex delivers a solution specifically designed for 318 and 360 cubic inch engines that require exact port alignment and reliable long-term sealing.

Remflex exhaust gaskets use a unique perforated steel core laminated with a high-temperature composite facing that conforms to the mating surfaces of your heads and manifold. Unlike traditional compressed asbestos or cheap composite gaskets that crush and fail under thermal cycling, this multi-layer construction maintains its seal through repeated heat expansion and contraction cycles. The square end port profile matches the precise geometry of SBM cylinder heads, ensuring zero interference and perfect alignment—critical factors that prevent blow-by, exhaust scavenging loss, and header warping that compromise both power output and durability.

Mechanics and engine builders working on 318 or 360 Mopar platforms—whether racing, street performance, or restoration—rely on these gaskets for their proven track record of lasting 50,000+ miles without re-sealing. Installation is straightforward on most manifold-to-head configurations; simply position the gasket with the square ports aligned to your head ports and torque your manifold bolts in the proper sequence. These gaskets are essential for anyone eliminating vacuum leaks, upgrading headers, or performing any cylinder head service on small-block Chrysler engines where a quality seal directly impacts both performance and reliability.