Rectangular Port header gaskets for Chrysler LA-series small block engines, covering 1968–1992 318, 340, and 360 applications. These gaskets are built with a high-temperature expanded-steel core for strength, stability, and consistent torque retention under severe exhaust heat. The graphite-faced surface conforms to minor flange irregularities, offers excellent thermal conductivity, and maintains sealing integrity over long-term use. High-recovery material helps retain clamp-load and keeps the flange sealed even if pressure shifts. The gaskets can also be trimmed for modified port shapes. Suitable for OE replacement, high-performance street builds, drag racing, and oval-track applications.