March Performance Engine Coolant Thermostat Housing

March Performance Billet Thermostat Housings: Precision Cooling for Serious Builders

When it comes to engine cooling components that combine form and function, March Performance stands apart from the crowd. Best known for their industry-leading pulley and accessory drive systems, March Performance brings that same exacting standard to their line of engine coolant thermostat housings — delivering billet-quality construction where most builders still settle for brittle cast iron or generic aluminum castings.

Built from the Same DNA as Their Pulley Systems

For over 28 years, March Performance has been a premium provider of serpentine and V-belt pulley kits, and that deep background in precision engine accessories directly informs the quality of their thermostat housing lineup. Billet thermostat housings are CNC-machined in the USA from 6061-T6 aluminum and are available in polished, black, or clear coated finishes. That's the same aircraft-grade material and manufacturing philosophy March applies across their entire product line.

Engineering Details That Matter

March Performance's thermostat housings aren't just good-looking bolt-ons — they're engineered to solve real installation headaches. Most styles include mounting hardware and an O-ring for a clean seal, and the 1.5 in. radiator hose neck swivels inside the base for perfect routing. That swivel feature alone saves builders hours of frustration when trying to fit hoses in tight engine bays.

March Performance thermostat housings are compatible with OEM and numerous aftermarket thermostats, so you're not locked into a specific brand when it's time to replace the thermostat itself. The lineup covers a broad range of popular platforms, including small block Chevy (SBC), GM LS-series, Ford, and Chrysler big block engines, with multiple outlet angles available — straight, 45-degree, 75-degree, and 90-degree — to suit almost any hose routing scenario.

Finish Options to Match Your Engine Bay

March Performance understands that engine bay aesthetics matter just as much as reliability for custom builds and show cars. Their thermostat housings are offered in three distinct finishes: a mirror-bright polish for classic show car looks, black anodized for a stealthy blacked-out bay, and a clear coat that preserves the natural aluminum appearance without requiring ongoing maintenance. All brackets and pulleys have clear powder coatings that eliminate polishing in those hard-to-reach places — and the same low-maintenance philosophy carries through to their thermostat housing line.

Coverage for the Most Popular Performance Platforms

With 24 products in this category, March Performance's engine coolant thermostat housing lineup covers the engines that performance builders work with most. Whether you're swapping an LS into a classic muscle car, building up a small block Chevy street rod, or refreshing a big block Chrysler, there's a March housing engineered specifically for your application. Browse the full March Performance brand catalog to explore their complete range of engine accessories and drive system components that complement these housings.