Thermostat Housing SBC -20AN Straight

The March Performance Thermostat Housing SBC -20AN Straight is a precision aluminum component designed for small-block Chevrolet (SBC) engine builds that demand custom cooling system configurations. This housing serves as the interface between your engine block and remote-mounted thermostat setups, enabling builders to relocate the thermostat away from the traditional factory location. Whether you're running a tight engine bay layout, integrating a custom radiator system, or designing a street rod with unconventional plumbing, this housing provides a clean, compact solution for modern cooling management.

Built from high-quality aluminum, the housing features a straight -20AN port configuration that accepts industry-standard AN hose fittings without adapters or reducers. The -20AN designation means the fitting accommodates a 1.25-inch inner diameter hose, providing ample flow capacity for aggressive cooling demands while maintaining structural integrity under pressure cycles. March Performance's engineering ensures precise port alignment and smooth internal passages to minimize turbulence and promote consistent coolant distribution.

This thermostat housing is essential for SBC engine builders working with custom cooling circuits, fuel-injection conversions, or other modifications that require a reliable and efficient cooling solution. Its compact 3 x 3 x 6 inch footprint makes it ideal for space-constrained applications where traditional cooling passages would interfere with aftermarket headers, intake manifolds, or belt-drive accessories.