Header Gasket 1-3/4 D Port

The ALLSTAR PERFORMANCE Header Gasket 1-3/4 D Port (SKU ALL 87262) is a precision-engineered exhaust manifold gasket designed specifically for small-block Chevy engine combinations. This gasket features a steel core laminate construction that provides the durability and heat resistance required for reliable sealing between the exhaust manifold and cylinder head in high-performance and street applications.

The 1.750-inch D port design matches OEM and common aftermarket small-block Chevy exhaust manifolds, ensuring proper alignment and sealing without modification. Steel core laminate gaskets excel at maintaining a consistent seal across thermal cycles, which is critical since exhaust header temperatures fluctuate significantly during acceleration and sustained high-RPM operation. The laminate construction resists blowout and gasket failure that can result from the extreme pressure and temperature differentials found in the exhaust port area.

This header gasket is essential for anyone rebuilding a small-block Chevy engine, installing a new or ported cylinder head, or replacing a failed gasket. Proper exhaust sealing prevents hot gases from escaping into the engine bay, which can degrade surrounding components and create safety hazards. ALLSTAR PERFORMANCE is a recognized manufacturer of high-quality engine gaskets and sealing products for performance and restoration work, and this D port gasket represents the standard choice for reliable exhaust sealing in small-block Chevy applications.

Each gasket is sold individually, making it ideal for single-engine jobs or as a replacement unit. The compact size and light weight (0.14 lbs) make handling and installation straightforward. Whether you're performing a full engine overhaul or a targeted gasket replacement, this ALLSTAR PERFORMANCE unit delivers the proven sealing performance small-block Chevy builders depend on.