Exhaust Manifold Set Cast Iron - SBC 2.5 Dia

The Exhaust Manifold Set Cast Iron – SBC 2.5 Dia from HOOKER is engineered for small-block Chevy (SBC) engine swaps and high-performance street or racing builds. This cast-iron manifold set serves as the foundation for extracting exhaust gases directly from your cylinder head, directing them toward your downpipe and exhaust system. Whether you're restoring a classic hot rod, upgrading a performance engine, or building a custom project car, proper manifold selection is critical to maximizing horsepower, torque, and engine efficiency while maintaining reliability under sustained operation.

Cast-iron construction provides superior heat retention and durability compared to lighter alternatives, making these manifolds ideal for street applications and moderate performance use. The 2.5-inch diameter outlet matches standard exhaust system tubing, ensuring seamless integration with aftermarket headers, collectors, and muffler combinations. HOOKER's manifold design balances exhaust scavenging efficiency with practical fitment in tight engine bays, reducing backpressure while maintaining structural integrity under continuous thermal cycling. At 36.5 pounds, these manifolds deliver the mass necessary for thermal stability without excessive weight penalty—a critical balance for street-driven vehicles where engine longevity matters as much as performance gains.

This exhaust manifold set benefits builders working with small-block Chevy engines in 1955–1979 chassis, LS-swapped classics, and late-model performance platforms using SBC bolt-on components. Installation requires basic mechanical skill, proper gasket selection, and attention to bolt torque specifications to prevent exhaust leaks. The 11 x 7.5 x 23-inch package fits within standard engine bay constraints, though clearance verification with your specific vehicle and headers is recommended before purchase. Compatibility with dual-outlet or single-outlet downpipes depends on your exhaust system design; verify outlet configuration and flange diameter with your existing or planned exhaust components for optimal fitment and performance.