Exhuast Gasket SBC 23 Degree Dart Platinum

The Exhaust Gasket SBC 23 Degree Dart Platinum from BEYEA CUSTOM HEADERS is a precision-engineered header gasket engineered specifically for small block Chevy applications using 23-degree cylinder head angles. This rectangular port gasket measures 1.770 x 1.550 inches and features a steel core graphite construction, a time-tested material combination that balances durability with sealing integrity. Supplied as a pair, these gaskets are designed to prevent exhaust leakage at the manifold-to-head interface—a critical seal point that directly impacts engine efficiency and performance.

Steel core gaskets with graphite facings are the industry standard for small block Chevy headers because they withstand the thermal cycling and pressure cycling that custom header systems experience. The graphite facing provides conformability to mating surfaces while the steel core maintains dimensional stability under sustained heat. This design prevents blow-through—a failure mode that undermines performance and allows unburned fuel to escape before it contributes to power output. The Dart Platinum 23-degree head angle specification means these gaskets mate correctly only with cylinder heads cut to that exact angle; incorrect angle matching will compromise the seal and void the application.

This gasket pair is essential for enthusiasts building or rebuilding small block Chevy engines with performance headers, particularly those running Dart Platinum or similar 23-degree cylinder head packages. Whether the application is a street engine, bracket racing platform, or dyno-tested build, correct gasket selection prevents the frustration of exhaust leaks that degrade throttle response and create false diagnostic readings. The rectangular port design matches common small block Chevy header outlet configurations, ensuring proper alignment during installation.