If you’re building around a Honda J Series engine, the factory water neck setup can be limiting once you start customizing. This MMS Billet Water Neck is designed to give you a clean, flexible solution whether you’re running a simple setup or fabricating a full custom cooling system.
Machined from 6061 aluminum, these flanges are built to fit right and seal properly without forcing you into unnecessary modifications. It’s a solid upgrade, especially if you’re running a Honda-to-GM adapter and want to avoid cutting the bellhousing. Whether you use them as-is or build off them, they give you the flexibility to route your cooling system the way you want.
