Upgrading your k24 thermostat housing for better flow

Swapping out your old k24 thermostat housing is one of those small jobs that makes a massive difference when you're piecing together a K-series swap or just trying to clean up your engine bay. If you've ever looked at the stock setup on a K24A2 or a K24Z3, you know exactly what I'm talking about. The factory housing is often this bulky, plastic piece of hardware that looks like it was designed more for ease of assembly at the factory than for actual performance or aesthetics. When you're stuffing one of these engines into a chassis it wasn't meant for, like an EG Civic or an empty Miata engine bay, that stock housing starts to become a real headache. ...

February 6, 2026 · 7 min · Gallo Angeles