Ford Racing 90-Degree Thermostat Housing | 302 / 351W | Fox Body Mustang 1979–1995 | M-8592-M90
Ford Racing 90-Degree Thermostat Housing – 302 / 351W | Fox Body Mustang 1979–1995 | M-8592-M90
Fits Ford 302 (5.0L) and 351 Windsor engines in Fox Body Mustangs 1979–1993 and SN95 Mustangs 1994–1995. Confirm your Mustang uses the 302 or 351W small-block Windsor — this housing is not compatible with other Ford engine families (e.g. 351 Cleveland, 390 FE, or modular 4.6L/5.4L). The 90-degree exit angle routes the upper radiator hose toward the driver’s side — correct for the stock Fox Body cooling system layout.
Ford Racing M-8592-M90 die-cast aluminium 90-degree thermostat housing for the Ford 302 and 351 Windsor small-block V8. Direct OEM-spec replacement for Fox Body Mustang applications where the factory housing has corroded, pitted, or cracked at the coolant sealing surface. Made in the USA by Ford Racing — the performance division of Ford Motor Company. 0.8 lbs. Ships fast across Canada and the US.
Fox Body Thermostat Housing — Why Replacement Is Common
The factory thermostat housing on the Fox Body Mustang 302/351W is die-cast aluminium mated directly to the iron intake manifold. Over decades of service, two failure modes are common:
- Coolant corrosion and pitting: Acidic or degraded coolant attacks the aluminium sealing surface over time, creating pits and voids that prevent the thermostat housing gasket from sealing flat. The result is a persistent coolant leak at the thermostat housing that cannot be fixed by re-torquing or replacing the gasket alone — the housing itself must be replaced.
- Galvanic corrosion: The dissimilar metal contact between the aluminium housing and cast iron intake manifold creates a galvanic corrosion cell, particularly in neglected or contaminated cooling systems. This accelerates corrosion at both mating surfaces.
Coolant leaks at the thermostat housing are one of the most common cooling system issues on Fox Body Mustangs. When the sealing surface is compromised, the correct fix is a new housing — and the Ford Racing M-8592-M90 is the OEM-spec solution.
90-Degree Exit — Stock Fox Body Routing
The 90-degree housing directs the upper radiator hose exit perpendicular to the engine’s centreline — routing toward the driver’s side of the engine bay, matching the stock Fox Body upper radiator hose path. This is the correct replacement for any Fox Body or SN95 Mustang running a stock or stock-layout cooling system. For engine swap applications or custom radiator routing that requires a different exit angle, confirm the required housing orientation before ordering.
Ford Racing — OEM-Source Quality
The M-8592-M90 is manufactured by Ford Racing (Ford Performance Parts) — the performance division of Ford Motor Company. Ford Racing parts carry the “M-” Motorsport part number prefix, indicating parts engineered and produced to Ford’s own specifications. Die-cast from aluminium in the USA, this housing is dimensionally identical to the factory unit and will fit, seal, and function exactly as the original. For Fox Body owners who want a genuine Ford-sourced replacement rather than a generic reproduction casting, the M-8592-M90 is the correct choice.
302 and 351W only — not for Cleveland, FE, or modular Ford engines. 90-degree exit — confirm routing for non-stock cooling layouts. Replace thermostat and gasket at the same time as the housing. Use fresh coolant after installation.
Specifications
- Brand: Ford Racing (Ford Performance Parts)
- Part Number: M-8592-M90
- Type: 90-degree thermostat housing
- Material: Die-cast aluminium
- Origin: Made in USA
- Application: Ford 302 (5.0L) and 351 Windsor — Fox Body Mustang 1979–1993, SN95 Mustang 1994–1995
- Not for: 351 Cleveland, 390 FE, 4.6L / 5.4L modular engines
- Weight: 0.8 lbs