LS Thermostat Housing w/ 20AN Male Nipple Anodizd

The LS Thermostat Housing with 20AN Male Nipple from Billet Specialties is a purpose-built cooling system component designed for LS engine swaps and custom cooling line configurations. Built for enthusiasts running modified LS powerplants—whether in classic cars, trucks, or custom builds—this anodized aluminum housing replaces the factory plastic unit with a precision-engineered alternative. The 20AN male nipple outlet allows direct integration with braided stainless steel hose lines, enabling builders to route coolant precisely without restrictive factory pathways.

Machined from billet aluminum and anodized for corrosion resistance, this thermostat housing maintains structural integrity under high coolant pressure and elevated engine bay temperatures common in turbocharged or supercharged LS builds. The anodized finish protects against oxidation and provides a durable, professional appearance that resists weeping and leaks at critical seal points. The 20AN male nipple fitting is industry-standard SAE size, compatible with 20AN hose adapters, reducers, and T-fittings used throughout custom cooling circuits—critical for custom water pump setups, remote oil coolers, transmission coolers, or intercooler plumbing on high-performance LS engines.

Ideal for LS engine swap builders, turbo and supercharger installations, and custom cooling system designers, this housing suits anyone eliminating restrictive factory plumbing in favor of custom line routing. Installation is straightforward on LS1, LS2, LS3, and LS9 variants, fitting where the original plastic housing mounted. The lightweight billet construction—just 0.42 lbs—adds negligible weight while improving thermal management and component reliability on street or track applications requiring custom coolant paths and high-flow setups.