Header Gskts Seal-4-Good SBC D-Port 1.375

The Header Gaskets Seal-4-Good SBC D-Port 1.375 from Patriot Exhaust is a multi-layered aluminum exhaust header gasket pair engineered for small-block Chevrolet applications from 1992 through 1997. This component bridges the critical seal between your engine block and exhaust manifold, where combustion pressures, thermal cycling, and vibration demand a gasket that maintains integrity under demanding conditions.

Multi-layered aluminum construction provides superior heat resistance and durability compared to traditional gasket materials. The D-port configuration (1.450 x 1.375 inch) matches OEM bolt patterns and port geometry for SBC heads, ensuring precise fitment without modification. Each pair comes ready to install—no additional prep required. This gasket design handles the thermal stress of repeated heat cycling while maintaining its sealing properties across extended service intervals, critical for both stock and modified LT-series engines operating under varied load conditions.

Buyers restoring or maintaining 1992–1997 small-block Chevrolet engines—whether for street performance, off-road duty, or marine applications—require a header gasket that resists blowout and maintains sealing consistency. Patriot Exhaust gaskets address the common failure points of original equipment or inferior aftermarket gaskets: premature erosion, thermal cracking, and loss of clamping load. Lightweight at 0.4 lbs per pair, these gaskets are quick to install during manifold or header service without requiring extended engine downtime.

SBC header gasket selection impacts both emissions integrity and exhaust system longevity. The Seal-4-Good line from Patriot represents a proven platform for LT-series engines where port-to-manifold alignment is critical. Whether you're upgrading a factory manifold or sealing a performance header, this multi-layered aluminum gasket pair delivers the thermal stability and pressure resistance expected in modern small-block applications.