Thermostat Housing LS 90 Degree Clearcoat

The Thermostat Housing LS 90 Degree Clearcoat by March Performance is a precision water neck designed for GM LS-series engine swaps and builds where routing flexibility and corrosion resistance are non-negotiable. As a mechanic working with LS conversions, you'll appreciate having a 90-degree outlet configuration that lets you position coolant hoses exactly where your custom plumbing demands—eliminating the need for adapter fittings and reducing potential leak points. This casting replaces the stock LS thermostat housing and serves as the foundation for your coolant circulation system, making it a critical component in any serious engine rebuild or swap project.

Constructed from lightweight aluminum and finished in clear anodized coating, the Thermostat Housing LS 90 Degree Clearcoat resists oxidation and corrosion far better than bare aluminum or painted alternatives—a real advantage in wet climates or when exposed to road salt. The 1-1/2 inch ID hose barb connection accepts standard radiator hose sizes without forcing oversized tubing into tight engine bay spaces, while the integrated O-ring seal and included mounting hardware eliminate guesswork during installation. The 90-degree flow path is engineered to work seamlessly with LS-series water pump geometry, maintaining optimal coolant velocity and heat transfer efficiency throughout your cooling system.

This housing is essential for LS-powered street rods, race cars, truck conversions, and engine swaps where OEM thermostat locations don't fit your custom layout. The clear anodized finish provides both durability and a clean, finished appearance under the hood—avoiding the dull aluminum look that demands constant polishing. Installation is straightforward with the O-ring and fasteners included; simply torque the housing to the block, verify hose routing before pressurizing the system, and you're ready to manage coolant flow on your own terms. Whether you're building a mild street engine or a high-output competition setup, this March Performance housing delivers the reliability and fitment flexibility that separates professional builds from compromises.