March Performance BTH-216-08 LS Engine Water Neck Thermostat Housing -20AN Black Billet

The March Performance BTH-216-08 is a precision-engineered billet aluminum water neck and thermostat housing designed specifically for GM LS engines. This high-performance cooling component features a straight outlet configuration with a -20AN fitting, providing exceptional flow capacity for high-performance and racing applications.

Key Features:

• Two-piece billet aluminum construction for maximum durability and heat dissipation
• -20AN male fitting for direct connection to braided hose cooling systems
• Straight outlet design for clean, direct routing in tight engine bays
• Black anodized finish for corrosion resistance and professional appearance
• Precision CNC-machined for perfect fitment on LS1, LS2, LS3, LS6, LS7, and LSX engines
• Eliminates restrictive factory plastic components

This thermostat housing is ideal for street performance, road racing, and drag racing applications where reliable cooling and professional aesthetics are essential. The large -20AN port supports high-flow cooling systems required by supercharged, turbocharged, and naturally aspirated high-output LS builds.