This Speed Engineering billet thermostat housing replaces the OEM plastic thermostat housing on 2014–2023 GM LT engines and comes with a 160° thermostat. Speed Engineering notes that the OEM plastic units are known to crack, which can cause coolant loss.
The housing also moves the 5/16" bleed hose to follow the same angle as the radiator hose. This keeps the hose out of the way during belt changes and routes it away from the supercharger belt, so a belt failure will not hit the hose and break it off the housing.
⚠️ Important Notes:
- Uses an LS3-style thermostat
Features:
- Billet Thermostat Housing: Replaces the OEM plastic housing
- 160° Thermostat: Included
- Rerouted 5/16" Bleed Hose Port: Follows the radiator hose angle
- Uses LS3-Style Thermostat
- Fits 2014–2023 GM LT Engines: LT1 and LT4
FAQ
Which engines does this thermostat housing fit?
It fits 2014–2023 GM LT engines, including the LT1 and LT4.
Is a thermostat included?
Yes. The housing comes with a 160° thermostat. It uses an LS3-style thermostat.
Why replace the factory thermostat housing?
The OEM housing is plastic, and Speed Engineering notes those units are known to crack and lose coolant.
What does the rerouted bleed hose do?
It moves the 5/16" bleed hose out of the way of belt changes and away from the supercharger belt, so a belt failure will not break it off the housing.
Is this part street legal?
No. Speed Engineering sells this thermostat housing as a race-only product intended for competition use only. Installation on a street-driven vehicle may violate the Clean Air Act (42 U.S.C. 7522(a)(3)).
⚠️ Race Use Only: This product is manufactured and sold for installation on vehicles used solely for competition. Once installed, the vehicle may not be used, registered, or licensed for use on a public road or highway. Installation on a street-driven vehicle may violate the Clean Air Act 203(a)(3), 42 U.S.C. 7522(a)(3).
