Header Gasket Set - SBC Sq. Port 1.450 x 1.450

The Header Gasket Set – SBC Sq. Port 1.450 x 1.450 from MAHLE ORIGINAL/CLEVITE (MPN MS19975) is a precision-engineered gasket pair designed for small-block Chevy engines with square port heads. Built with a steel core graphite construction, this gasket set delivers reliable sealing performance at the critical junction between header and cylinder head, where thermal cycling and combustion pressure demand unwavering integrity.

The 1.450 x 1.450 inch square port configuration is purpose-built to match stock and popular aftermarket small-block Chevy heads, ensuring precise port alignment and maximum sealing surface contact. Steel core construction resists blowout under sustained heat and pressure, while the graphite facing provides conformability to imperfect head and manifold surfaces—a critical feature in high-mileage engines or those subject to repeated thermal stress. The gasket pair (two gaskets per set) accounts for both exhaust header flanges, eliminating the need for separate orders.

This gasket set serves engine builders, restoration specialists, and performance enthusiasts performing header installation, cylinder head replacement, or manifold work on small-block Chevrolet platforms. Whether managing a stock rebuild, a street engine refresh, or a mild performance application, proper header gasket selection prevents exhaust leaks that compromise engine efficiency and create unwanted under-hood heat. MAHLE ORIGINAL is a OEM-tier manufacturer trusted across the automotive rebuild sector for dimensional accuracy and material consistency.

Small-block Chevy engine families span decades and countless variations, making gasket specification critical. The square port designation ensures compatibility with the common head casting profiles and prevents installation errors that can result in poor sealing or manifold fitment issues. Keeping a verified gasket set on hand during header or cylinder head work avoids job delays and ensures the assembly meets OEM sealing standards.