Exhaust Gskt 302-351W W/ GT40 Heads

The Exhaust Gskt 302-351W W/ GT40 Heads by Mr. Gasket is a precision composite gasket pair engineered for small block Ford engine builders and enthusiasts seeking reliable exhaust sealing. Designed specifically for small block Ford applications running GT40 cylinder heads, this exhaust header gasket maintains a critical seal between the cylinder head and exhaust manifold—a junction point exposed to extreme temperature cycling and pressure variations. Whether you're rebuilding a classic 302 or 351W engine or upgrading an existing platform, proper gasket selection is non-negotiable for preventing exhaust leaks, maintaining performance, and avoiding costly damage to surrounding components.

This pair features Mr. Gasket's proven composite construction, which combines high-temperature resilience with reliable sealing characteristics across repeated thermal cycles. The gaskets are precisely sized to accommodate the 1.250 x 1.750 inch oval port geometry standard on small block Ford GT40 heads, ensuring perfect alignment with header flanges and minimizing blowby risk. Composite gasket material offers superior durability compared to traditional steel or multi-layer designs, resisting degradation from exhaust heat while maintaining gasket crush and sealing integrity over thousands of miles. The oval port profile matches OEM and performance aftermarket headers, making these gaskets compatible with a wide range of small block Ford exhaust systems.

Technicians and engine builders working on 302 and 351W small block Ford platforms will find this gasket pair essential for header installation, engine rebuilds, and performance upgrades. The pair format eliminates the need for separate purchases and ensures matched surfaces for both cylinder heads. Proper installation requires light torque sequence to manufacturer specifications—typically 25–30 ft-lbs on small block Ford header bolts—allowing the composite material to set without over-compression. These gaskets work equally well with cast iron manifolds and tubular performance headers, making them a versatile choice for street engines, restorations, and mild performance applications where dependable sealing is paramount.