Thermostat Housing LS -16AN Straight

The Thermostat Housing LS -16AN Straight is a precision cooling system component engineered for LS-series engine builds. This water neck adapter serves as the critical junction between your engine block and radiator hose, managing coolant flow and thermostat integration on high-performance and street applications. Built for engine builders, enthusiasts, and professional shops, this component eliminates leaks and ensures reliable thermal management in LS swaps and custom engine platforms.

Constructed from aluminum and finished in black anodized coating, the Thermostat Housing LS -16AN Straight delivers corrosion resistance and durability in demanding engine environments. The straight -16AN male port connects directly to -16AN hose fittings, providing a secure, leak-free interface without adapters or reducers. An integrated O-ring and included hardware ensure proper sealing and installation—no additional gaskets or fasteners required. The compact 3 x 3 x 6 inch form factor integrates seamlessly into tight engine bay configurations common in LS conversions.

This housing is ideal for LS1, LS2, LS3, and LS9 engine swaps into classic muscle cars, trucks, and street rods where OEM cooling systems require modernization. The -16AN straight design works best in applications where hose routing flows directly from the engine block without angled bends. Installation requires basic mechanical skill and standard hand tools—simply bolt to the engine block, install the thermostat, and connect your radiator hose. Weighing just 0.4 lbs, it adds negligible mass while eliminating traditional plastic housings prone to cracking in high-heat scenarios.