SBC Aluminum Header Gasket Kit - Sq. Port

The PROFORM SBC Aluminum Header Gasket Kit – Sq. Port is an essential exhaust sealing solution for small block Chevy engines equipped with square port cylinder heads. Built to prevent exhaust leaks at the header-to-head interface, this pair of aluminum gaskets delivers reliable performance in high-heat environments where standard composite gaskets fall short. Whether you're running a stock rebuild, street engine, or performance modification, proper header gasket selection directly impacts exhaust scavenging efficiency and prevents hot exhaust gases from escaping into the engine bay.

Constructed from durable aluminum material, this kit features a 1.500-inch square port design that matches the casting profile of square port SBC cylinder heads, ensuring flush seating and maximum gasket life. Aluminum gaskets offer superior heat dissipation compared to composite alternatives, reducing localized hot spots and gasket degradation under sustained high-rpm operation. The precision-engineered port geometry accommodates the specific flow characteristics of square port heads while maintaining a tight seal throughout the combustion cycle. Each gasket in this pair is individually crafted to exacting tolerances, minimizing installation gap and reducing the risk of compression loss or exhaust bypass.

This gasket kit is ideal for small block Chevy enthusiasts performing header installation, engine reassembly, or exhaust system maintenance on vehicles with square port heads. The compact, lightweight design (0.5 lbs total) makes handling and positioning straightforward during installation. These gaskets work seamlessly with cast iron or tubular headers and are compatible with standard header bolt patterns found on SBC applications from 1967 forward. Mechanics and engine builders trust PROFORM's gasket products for their consistent quality and reliability across both street and competition builds.