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Eliminate Coolant Leaks Before They Start with a Billet Thermostat Housing
The Billet Technology 300724 Billet Aluminum Thermostat Housing replaces the factory OEM thermostat housing with a precision CNC-machined billet aluminum housing on your 2021-2023 Dodge Durango SRT Hellcat. The factory thermostat housing on these high-output 6.2L Hellcat supercharged HEMI engines is a known weak point that warps and develops coolant seepage under the repeated thermal cycling of hard driving. The 300724 is CNC machined in Lake Worth, Florida from solid 6061-T6 certified domestic aircraft-grade aluminum, delivering a permanent solution that also adds a premium machined appearance to the engine bay. Direct bolt-in fit, OEM gasket compatible, no modifications required.
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2021 | Dodge | Durango | SRT Hellcat |
| 2021-2026 | Dodge | Durango | SRT Hellcat |
Specifications
| Detail | Value |
|---|---|
| Part Number | 300724 |
| Brand | Billet Technology |
| Material | Solid 6061-T6 Aircraft-Grade Aluminum |
| Finish | Satin (Raw Machined Aluminum) |
| Product Type | Thermostat Housing |
| Engine Compatibility | 6.2L Hellcat supercharged HEMI |
| Country of Origin | USA |
| Warranty | Limited Lifetime Warranty Against Defects In Materials And Workmanship |
What Is Included
- 1x Billet Technology 300724 Billet Aluminum Thermostat Housing
- Gasket set (verify on product page , select versions include gasket)
- Installation hardware
Frequently Asked Questions
Does the Billet Technology 300724 thermostat housing require a new thermostat?
The 300724 accepts the OEM thermostat. You can reuse your existing thermostat or install a new OEM-spec thermostat at the time of installation. Refer to the factory service manual for the correct thermostat specification.
Does the billet thermostat housing use OEM gaskets?
Yes. The this product is machined to accept OEM gaskets or an OEM-equivalent gasket set. Use a fresh gasket at installation. Some kits include a gasket , refer to the What Is Included section.
Will the billet thermostat housing improve cooling performance?
The this product is a direct replacement with matched coolant passage geometry. While it does not alter thermostat opening temperature, eliminating the factory housing material's tendency to warp ensures consistent thermostat seating and coolant flow.
Is the this product compatible with OEM and aftermarket coolants?
6061-T6 aluminum is compatible with standard ethylene glycol and OAT-based coolants. Do not mix coolant types. Flush the system if switching coolant formulas.
Does this thermostat housing fit both the Charger and Challenger?
Both vehicles share the same engine family. Refer to the fitment table for exact year and model compatibility.
What torque specification should I use for the thermostat housing bolts?
Torque fasteners to the OEM specification listed in the factory service manual for the 6.2L Hellcat supercharged HEMI. Over-torquing can crack the housing flange.
Is the Billet Technology thermostat housing made in the USA?
Yes. The this product is CNC machined in Lake Worth, Florida from certified domestic 6061-T6 aluminum.
Do I need to bleed the cooling system after replacing the thermostat housing?
Yes. Any time the cooling system is opened, air pockets can form. Fill the system, run the engine to operating temperature, check for leaks, and top off the coolant level after the thermostat opens.
Installation Instructions
- Allow the engine to cool completely. Never work on a hot cooling system.
- Place a drain pan under the vehicle and drain the coolant by loosening the lower radiator hose or drain petcock.
- Disconnect the radiator hose, heater hose, and any other coolant lines attached to the factory housing.
- Remove the OEM fasteners securing the factory thermostat housing.
- Remove the factory housing and thermostat. Clean the mating surface thoroughly.
- Install a fresh gasket on the Billet Technology this product billet housing.
- If reusing the OEM thermostat, verify it is in good condition. Install the thermostat into the billet housing.
- Mount the 300724 to the engine block mating surface and torque fasteners to OEM specification.
- Reconnect all coolant hoses and secure with OEM-style clamps.
- Fill the cooling system with the correct coolant type and bleed all air from the circuit.
- Start the engine, bring to operating temperature, and check for leaks.
- Top off coolant level after the thermostat opens and recheck after first heat cycle.
WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
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