LT Thermostat Housing 15 Degree Black

The Billet Specialties LT Thermostat Housing 15 Degree Black (BLK90520) is a precision-engineered water neck designed for GM LT-series engine cooling systems. This component features a 15-degree angle with a 1-1/2-inch hose barb configuration, engineered to optimize coolant flow geometry and reduce turbulence in the cooling circuit. The swivel design accommodates varying hose routing requirements common in street rods, restorations, and high-performance engine builds where OEM cooling passages may not align with modern intake manifold designs.

Construction combines aluminum housing with black anodized finish for corrosion resistance and a clean appearance under the hood. Stainless steel hardware eliminates galvanic corrosion concerns when used with various coolant types and extended service intervals. The swivel connection allows hose positioning flexibility without requiring multiple water neck variants, reducing inventory needs and simplifying installation on non-original engine mounting configurations. O-ring sealing provides a positive, repeatable seal without relying on compression fittings alone.

This LT thermostat housing addresses the cooling system integration challenges faced by builders transitioning modern LT powerplants into older chassis or custom applications. The 15-degree angle is commonly used where header clearance or intake manifold geometry requires angled water passage entry rather than straight-through designs. Whether supporting a full LS/LT swap, radiator relocation, or non-standard cooling line routing, this component delivers the geometry and material quality expected from Billet Specialties' engine accessory line.