Header Gasket - LS1 Large Race Port

The FEL-PRO Header Gasket LS1 Large Race Port (MPN 1440) is a steel core laminate exhaust manifold gasket engineered for GM LS-series engines running large-port cylinder heads. This gasket features 1.900-inch round ports and is supplied as a pair, making it essential for high-performance LS1 builds where OEM gasket materials cannot tolerate sustained heat cycling and boost pressures common in forced-induction or heavily modified applications.

FEL-PRO's steel core laminate construction provides superior sealing integrity compared to conventional graphite gaskets. The laminated design resists blowout under high exhaust temperatures and pressure spikes, critical for turbocharged, supercharged, or nitrous-assisted LS platforms. The large race port specification matches the flow characteristics of aftermarket aluminum cylinder heads, ensuring proper gasket compression and port alignment without flow restriction. At 0.26 lbs per pair and compact package dimensions, installation fits standard engine bay configurations without modification.

This gasket is purpose-built for LS engine builders and performance enthusiasts upgrading from stock manifolds to large-port racing heads. It's required when mixing aftermarket aluminum heads with OEM or custom exhaust manifolds, and is particularly relevant for bracket racing, road course competition, and street performance builds where sustained high-RPM operation and thermal cycling demand maximum reliability. The FEL-PRO brand reputation in high-temperature sealing applications makes this gasket the standard choice for serious LS platform builds where gasket failure is not an option.