March Performance Billet Water Neck Thermostat Housing Small Big Block Chevy

March Performance billet water neck thermostat housings, also called thermostat housings or water necks, give your engine's cooling system a clean, durable outlet for the radiator hose. Each one is CNC-machined in the USA from 6061-T6 aluminum, so it is strong, corrosion-resistant and light. The finished part looks good in a show build or a street/strip engine bay.

Key Features:

• CNC-machined billet construction from 6061-T6 aluminum
• Precision machining for a clean fit and a consistent seal
• Mounting hardware and an O-ring are included for a clean seal
• Designed to work with OEM and many aftermarket thermostats (thermostat not included)
• Offered in several styles and finishes, including polished, black anodized and clearcoated

Replacing a stock cast housing with a March Performance billet water neck improves both appearance and durability. Choose the style and finish that suit your engine and hose routing.