Thermostat Housing GM LS w/16AN - Clear

The CVR Performance Thermostat Housing GM LS w/16AN in clear anodized aluminum is a precision cooling system component engineered for GM LS-series engine swaps and custom builds. This water neck features a 90-degree configuration with a 16 AN male swivel connection and O-ring seal, delivering a leak-free interface in high-flow cooling applications. Built from lightweight aluminum with a clear anodized finish, it resists corrosion while maintaining visibility of coolant flow and cleanliness—a practical advantage for engine bay diagnostics and maintenance.

The 16 AN swivel connection accommodates high-capacity cooling lines common in LS engine builds, eliminating turbulence at the thermostat housing transition and improving coolant circulation efficiency. The O-ring design ensures a positive seal without overtightening, reducing the risk of stripped fittings—a frequent failure point in custom cooling systems. Clear anodizing provides superior corrosion resistance compared to bare aluminum while preserving visual inspection of internal coolant passages, essential in builds where cooling system integrity is critical to engine longevity.

This component serves engine builders, performance shops, and LS swap enthusiasts who demand OEM-equivalent or superior quality from aftermarket cooling components. Whether upgrading a stock GM LS cooling system or architecting a custom cooling solution for supercharged or turbocharged applications, this thermostat housing provides the flow capacity and reliability required. The compact 5.5 x 3 x 7.5-inch footprint fits tight engine bays while the lightweight 0.76-pound design minimizes underhood mass.