Thermostat Housings

Upgrade your cooling system with CVF Racing Big Block Chrysler Thermostat Housings, designed for compatible Mopar 383, 400, and 440 V8 engines. Also known as Big Block Mopar water necks, thermostat necks, or water outlets, these housings secure the thermostat and connect the upper radiator hose to your engine's cooling system. Ideal for classic Dodge Chargers, Challengers, Plymouth Road Runners, GTX models, and custom performance builds, CVF Racing thermostat housings provide a clean, finished appearance for your Chrysler B-series or RB-series engine.