'-20 AN Thermostat Housing for GM LT Engines
SKU: WA01001LT
Wide Open Design’s -20 AN LT Thermostat Housing is precision crafted from 6061 billet aluminum and machined to exact tolerances for a clean, reliable solution when plumbing your LT based build.
Designed to simplify custom coolant routing, this housing allows you to run -20 AN hose and fittings while retaining your factory thermostat — maintaining proper engine management and
Included Items
- (1) -20 LT Thermostat Housing
(Thermostat and AN fittings sold separately.)
Specifications
- Hose Size: -20 AN
- Material: 6061 Billet Aluminum
- Thermostat Compatibility: Factory LT Thermostat
- Application: GM LT-based engines
- Manufacturing: Precision Machined in the USA
- Key Features
- 6061 Billet Aluminum Construction: Exceptional strength, corrosion resistance, and long-term durability.
- Precision Machined: Manufactured to tight tolerances for proper sealing and reliable fitment.
- -20 AN Outlet: Simplifies coolant plumbing with secure AN connections. No more hunting for molded rubber hoses.
- Factory Thermostat Compatible: Retains OEM thermostat functionality to maintain proper ECU-controlled operating temperature.
- Engine Bay Upgrade: Clean AN plumbing enhances appearance while improving serviceability.
Fitment
Designed for GM LT-based engines, including:
- LT1
- LT4
- LT5
- Other Gen V LT platforms
- LT engine swaps
- Tube chassis builds
Note: Always verify your thermostat style and coolant routing configuration before installation.
Tech Insight
Switching to -20 AN plumbing removes the guesswork from hose selection while delivering a more durable and service-friendly cooling system. Modern LT engines rely heavily on accurate coolant temperature readings for fuel mapping, timing control, and emissions performance. Retaining the factory thermostat ensures:
- Proper warm-up cycles
- Stable operating temperatures
- Consistent ECU data
- Reliable drivability