GM LS Cast Iron Exhaust Manifolds w/2.5in Outlet

The HOOKER GM LS Cast Iron Exhaust Manifolds with 2.5-inch outlet deliver proven performance for LS-series engine swaps in marine and automotive applications. Built from ductile iron with a silver ceramic coating, these manifolds are engineered to handle the sustained heat and corrosion exposure inherent to saltwater and freshwater environments. The 2.5-inch outlet diameter provides efficient exhaust scavenging while maintaining compatibility with standard marine exhaust systems, making these manifolds a direct-fit solution for LS engine conversions in boats, trucks, and performance vehicles.

Ductile iron construction offers superior thermal conductivity and crack resistance compared to standard cast iron, critical for engine bays subject to thermal cycling and vibration. The silver ceramic coating resists oxidation and discoloration from high-temperature exposure while reducing radiant heat in the engine compartment. These manifolds arrive as a complete pair, ready for dual-manifold LS engine configurations. Weighing 30.48 lbs total, the manifolds mount directly to GM LS-series cylinder heads with factory bolt patterns, eliminating fitment guesswork on marine engine swaps where space and access are often constrained.

These manifolds serve boaters and engine builders upgrading from carbureted or naturally aspirated powerplants to modern LS platform architecture. Marine engine compartments demand exhaust solutions that withstand saltwater corrosion and condensation exposure without sacrificing flow characteristics. The 2.5-inch outlet size integrates seamlessly with existing marine wet-exhaust systems and aftermarket risers, reducing installation complexity. Whether retrofitting a center-console fishing boat, upgrading an offshore cruiser's propulsion, or building a performance ski boat engine package, these HOOKER manifolds provide the thermal durability and corrosion resistance that extended time on the water demands.

LS engine conversions have become the standard upgrade path for recreational and commercial marine applications due to superior reliability, parts availability, and modern fuel management. Factory GM LS exhaust manifolds are often unavailable for retrofit applications, making aftermarket options like these HOOKER units essential. The ceramic coating extends service life in corrosive marine environments where untreated cast iron oxidizes rapidly, protecting your investment and ensuring consistent performance across multiple boating seasons.