Redhorse Performance offers high-quality water necks designed for superior coolant flow and tight fitment. Built from billet aluminum, each thermostat housing ensures reliable performance in custom or OEM engine builds.
Subcategories
All Products
Shop Swivel, Fixed, and Thermostat Water Neck Options
Browse a complete selection of water neck styles at Redhorse Performance, including swivel, fixed, and thermostat housing configurations. These parts are crafted from premium billet aluminum for long-lasting durability and performance under high-heat conditions. Whether you're routing a radiator hose in a tight engine bay or replacing a stock part for better coolant flow, our water necks deliver a precise fit and excellent sealing. Each unit is engineered with the right style hose connections and a tight gasket seal for leak-free use. From restorations to performance upgrades, our water necks are built to perform and made to last.
Fitment for Popular Engine Types
Our water necks are designed to fit a wide range of engines, including small block and big block applications. Whether you're building a race car, upgrading a street machine, or restoring a classic engine, we have options that match your setup. Each thermostat housing is precision-machined for exact fitment, making it easy to install in factory or custom builds. Designed with varying radiator hose angles and outlet sizes, our water necks accommodate different engine bay layouts and cooling system requirements. Redhorse Performance delivers fitment solutions that meet the demands of modern performance and vintage compatibility.
Easy Installation with Leak-Free Results
Redhorse Performance water necks are engineered for a smooth installation process and lasting, leak-free performance. Machined from strong billet aluminum, each unit features a precisely machined flange and integrated gasket seal surface for perfect sealing every time. Whether you’re working with a small block or big block, installation is straightforward and efficient. These parts are built to handle extreme temperatures and pressures, delivering long-term reliability in any performance setup. Combined with the right style hose and proper torque, your upgraded thermostat housing ensures dependable cooling flow without drips or seepage.
Frequently Asked Question
What is a water neck?
A water neck, also known as a thermostat housing, connects the engine to the radiator hose and holds the thermostat in place. It directs coolant flow and plays a key role in engine temperature regulation.
What happens if you don't add water to coolant?
If you don't add water to your coolant mixture, the system may lack proper thermal conductivity. While coolant has additives to prevent corrosion, water is essential for effective heat transfer in the thermostat housing and water neck areas.
Is it okay to top up coolant with water?
In emergency situations, topping up coolant with water is acceptable—but not ideal long-term. A 50/50 mix of coolant and water is optimal for maintaining engine temperature and preventing corrosion in the water neck, gasket seal, and cooling system.