Exhaust Gasket-BUICK V8 OHV 364-425

The Exhaust Gasket-BUICK V8 OHV 364-425 from REMFLEX is a precision-engineered manifold seal designed for classic and vintage Buick Nailhead engines. Built for mechanics and enthusiasts who demand reliability on engines spanning 364 to 425 cubic inches, this gasket set addresses one of the most common leak points in high-performance V8 builds: the exhaust header-to-cylinder-head interface. Whether you're restoring a collectible Buick, upgrading a street machine, or troubleshooting exhaust leaks on a weekend cruiser, a quality exhaust gasket is non-negotiable for proper combustion sealing and long-term engine integrity.

This four-gasket set features square-port design with 1.125 x 1.563 inch openings, sized specifically to match Buick Nailhead cylinder head ports. The graphite composition provides superior thermal stability and resilience under the extreme temperature cycling that exhaust manifolds endure—critical for preventing gasket creep and blowby that degrade performance and fuel economy. Unlike traditional cork or composite gaskets that deteriorate over time, graphite gaskets maintain their sealing properties across thousands of heat cycles, reducing the need for frequent re-torquing and ensuring consistent exhaust scavenging in tuned engines.

Compatibility spans all Buick V8 OHV engines from 364 to 425 cubic inches, making this gasket set ideal for bolt-on header installations, manifold upgrades, and full engine rebuilds. The lightweight 0.3 lb set is compact enough for easy storage yet robust enough to seal under boost or high-RPM conditions. Installation is straightforward: clean the mating surfaces thoroughly, apply a light coat of high-temperature sealant if desired, and torque the header bolts in a star pattern to factory spec. For anyone upgrading from original equipment or dealing with persistent exhaust leaks, this REMFLEX gasket delivers the reliability expected from a purpose-built OE-quality product.