LS Thermostat Housing Straight Polished

The LS Thermostat Housing Straight Polished is a precision water neck replacement engineered for LS-series engine builds and restorations. This component serves as the critical junction between your radiator hose and cylinder head coolant passage, directing coolant flow while housing the engine's thermostat. Whether you're performing a full LS swap, upgrading cooling system aesthetics, or restoring an original GM engine to show-quality standards, this polished aluminum housing delivers both functional reliability and visual impact in the engine bay.

Constructed from lightweight aluminum with a mirror-polished finish, the LS Thermostat Housing Straight Polished accommodates a 1-1/2 inch inner diameter hose connection via a straight outlet configuration. The housing features a durable O-ring seal for leak-free coolant containment and pairs with stainless steel hardware to resist corrosion in high-heat engine compartment environments. The polished aluminum construction reduces weight compared to cast iron originals while the straight hose orientation simplifies plumbing in tight engine bay layouts common to swap installations and custom builds. This design eliminates sharp elbows that can trap air pockets, promoting efficient thermostat operation and stable coolant circulation across all RPM ranges.

LS engine enthusiasts—from weekend warriors performing Gen III or Gen IV swaps to professional fabricators—rely on this water neck for OEM-level reliability with custom appearance. The straight polished finish complements fuel-injected LS engine aesthetics, particularly in vehicles with visible engine bays or transparent intake manifold covers. Installation is straightforward for anyone with basic cooling system familiarity; the O-ring seal eliminates the need for traditional gasket material, and stainless hardware withstands repeated heat cycles without galling. Compatible with all GM LS-series platforms (LS1, LS2, LS3, LS7, L99, and truck variants), this housing is an essential upgrade when transitioning from original equipment or corroded factory components.