Click to zoom in
Billet Technology 30030 Billet Aluminum Water Neck for 6.4L 392 HEMI
Upgrade your factory thermostat outlet housing with the Billet Technology 30030 Billet Aluminum Water Neck. Designed for select Dodge Durango SRT, Dodge Durango SRT 392, Jeep Grand Cherokee SRT, and Jeep Grand Cherokee SRT8 models with the 6.4L 392 HEMI engine, this billet replacement helps eliminate common coolant leaks caused by warped or cracked OEM housings.
CNC machined in Lake Worth, Florida from solid 6061-T6 certified domestic aircraft-grade aluminum, this water neck provides a stronger, longer-lasting replacement for the factory plastic or OEM housing while adding a clean machined aluminum look to your engine bay.
Key Features
- Direct replacement for the factory water neck / thermostat outlet housing
- Fits select 6.4L 392 HEMI Dodge Durango and Jeep Grand Cherokee models
- CNC machined from solid 6061-T6 aircraft-grade aluminum
- Helps eliminate coolant seepage caused by OEM housing warping or cracking
- OEM-style coolant passage geometry for proper flow characteristics
- Compatible with OEM thermostat and OEM-style gaskets
- Satin raw machined aluminum finish
- Made in the USA
- Backed by Billet Technology’s limited lifetime warranty against defects in materials and workmanship
Vehicle Fitment
| Year Range | Make | Model | Trim | Engine |
|---|---|---|---|---|
| 2018-2023 | Dodge | Durango | SRT / SRT 392 | 6.4L 392 HEMI |
| 2012-2013 | Jeep | Grand Cherokee | SRT8 | 6.4L 392 HEMI |
| 2014-2021 | Jeep | Grand Cherokee | SRT | 6.4L 392 HEMI |
Specifications
| Part Number | 30030 |
|---|---|
| Brand | Billet Technology |
| Material | Solid 6061-T6 Aircraft-Grade Aluminum |
| Finish | Satin Raw Machined Aluminum |
| Product Type | Water Neck / Thermostat Outlet Housing |
| Engine Compatibility | 6.4L 392 HEMI |
| Country of Origin | USA |
| Warranty | Limited lifetime warranty against defects in materials and workmanship |
What Is Included
- 1x Billet Technology 30030 Billet Aluminum Water Neck
- Installation hardware
- Gasket set, when included by manufacturer or selected kit version
Frequently Asked Questions
Does this water neck require a new thermostat?
No. The Billet Technology 30030 accepts the OEM thermostat. You may reuse your existing thermostat if it is in good condition or install a new OEM-spec thermostat during installation.
Does this billet water neck use OEM gaskets?
Yes. This product is machined to accept OEM or OEM-equivalent gaskets. A fresh gasket is recommended during installation.
Will this water neck improve cooling performance?
This is a direct replacement housing with OEM-style coolant passage geometry. It does not change thermostat opening temperature, but it helps maintain proper sealing by replacing the factory housing that can warp or crack over time.
Is this compatible with OEM and aftermarket coolants?
Yes. 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.
Is this water neck made in the USA?
Yes. The Billet Technology 30030 is CNC machined in Lake Worth, Florida from certified domestic 6061-T6 aluminum.
Do I need to bleed the cooling system after installation?
Yes. Any time the cooling system is opened, air pockets can form. Fill and bleed the cooling system according to the factory service procedure.
Installation Notes
- Allow the engine to cool completely before servicing the cooling system.
- Drain coolant as needed using a drain pan.
- Disconnect coolant hoses from the factory housing.
- Remove the OEM fasteners and factory water neck.
- Clean the mating surface thoroughly.
- Install the thermostat and fresh gasket into the billet housing.
- Mount the Billet Technology 30030 water neck and torque fasteners to OEM specification.
- Reconnect coolant hoses and secure all clamps.
- Refill and bleed the cooling system.
- Start the engine, bring it to operating temperature, and inspect for leaks.
- Top off coolant after the thermostat opens and recheck after the 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, visit www.P65Warnings.ca.gov.
Billet Technology
Billet Technology produces precision CNC-machined billet aluminum accessories for performance vehicles. Their products include oil catch cans, filler caps, dipstick handles, and cooling system components machined from 6061 aluminum for a clean, professional engine bay appearance. Popular Billet Technology ProductsBrowse the full Billet Technology catalog to find the right upgrade for your application. Every product ships fast with fitment verified against manufacturer specifications. What are Billet Technology's most popular products?Billet Technology's top sellers include their oil catch cans, billet coolant reservoir caps, dipstick handles, and radiator caps, all CNC-machined from billet aluminum and available in anodized finishes. Are Billet Technology products vehicle-specific?Yes, Billet Technology makes direct-fit products designed for specific vehicles and engine bays, ensuring proper fitment without modification for supported applications. Explore related categories: Exhaust...
View Billet Technology Products
Cooling
Shop performance cooling parts at Black Ops Auto Works for premium radiators, thermostat housings, thermostats, coolant reservoirs, expansion tanks, radiator hoses, oil coolers, transmission coolers, fans and shrouds, water pumps, and thermal management upgrades for street, track, towing, diesel, and high-horsepower builds. Whether you are trying to control engine temps, improve reliability, or support demanding performance use, this collection is built around proven cooling-system upgrades for serious enthusiasts. Shop Cooling Parts by Category Browse automotive cooling system components across key product categories, including: Radiators Coolant reservoirs and expansion tanks Thermostat housings and thermostats Radiator hose kits and silicone coolant hoses Oil coolers and oil cooler accessories Transmission coolers Coolant bypass kits and coolant filters Fans and shrouds Radiator caps Water pumps Radiator shrouds, radiator stays, and cooling plates Thermal wrap, thermal tape, an...
View Cooling Products
Engine
This engine parts collection covers oil catch cans, thermostats, thermostat housings, radiator components, coolant accessories, engine covers, fuse box covers, cap covers, throttle bodies, supercharger pulleys, idler pulleys, tensioner pulleys, and engine bay dress-up parts for trucks, SUVs, muscle cars, boosted builds, high-horsepower street cars, and performance vehicles that need better reliability, cooling, airflow, oil control, and under-hood styling. The collection is particularly strong for Dodge Challenger, Charger, Durango, Jeep Grand Cherokee Trackhawk, and Ram TRX platforms running 6.2L Hellcat, 6.4L HEMI, and 5.7L HEMI engines, where oil catch can and cooling upgrades address known OEM weaknesses in the PCV and thermal management systems. Import performance platforms including GM LS-based builds, Chevrolet Camaro, and Corvette applications are also represented through Mishimoto, CSF, and ZPE GripTec product lines. Builders who invest in engine bay organization and reliab...
View Engine Products
Thermostat Housings
Welcome to our exclusive Thermostat Housings collection! Here, you'll find a wide range of products designed to keep your thermostat protected and functioning optimally. Why Choose Our Thermostat Housings? Durability: Crafted from high-quality materials to withstand various environmental conditions. Compatibility: Designed to fit most standard thermostat models. Easy Installation: User-friendly designs that allow for quick and hassle-free setup. Stylish Options: Available in various styles and colors to complement your home decor. Shop Our Top Picks Browse through our top-rated thermostat housings: Premium Thermostat Housing Eco-Friendly Thermostat Housing Smart Thermostat Housing Designer Thermostat Housing Get Started Today! Upgrade your heating and cooling system with our Thermostat Housings. Shop now and experience quality and efficiency like never before!
View Thermostat Housings ProductsLet customers speak for us
Looks pretty nice
Looks pretty nice, pricing was good and the reinforcement is a big plus.
Randy H.
Black Ops Auto Works
I emailed customer service to inquire about when it would be shipped
I emailed customer service to inquire about when it would be shipped. They checked and emailed me with the answer. Customer service is A1
Ralph J.
Black Ops Auto Works
Installation was easy
Installation was easy. The price is good and it looks great on the truck.
Ralph J.
RHO Small Grille Badge
Looks as good as it fits
Looks as good as it fits,
zachary d.
Seibon 70-73 Datsun 240Z OE Carbon Fiber Hood
Nothing like it
I love it great sound and response
Luis P.
Legmaker Dodge Durango HEMI Short Ram CAI 2011-Present 5.7L
Car totally diferent with the whole kit
Car totally diferent with the whole kit. Ive stood next to wide bodies and my car gets more attention at times . Ive bought the kit twice already.
Ding D.
2015-2023 Dodge Charger Carbon Fiber Wind Splitters
Fantastic emblem! Exactly what I was looking for
Fantastic emblem! Exactly what I was looking for. Great quality emblem.
Jacobus S.
Direct Connection Black Metallic Fender Badge
Worked great for my aftermarket hood on my Chrysler 2023 300C
Worked great for my aftermarket hood on my Chrysler 2023 300C. Thanks
Robert G.
Windshield Washer Squirter Relocation Kit Universal
Easy to install and makes car sound even better
Easy to install and makes car sound even better love the winn
Tracy H.
Legmaker Challenger/Charger Hellcat Demon & Redeye Air Intake
Awesome customer support
Awesome customer support. Had multiple issues with fedex and these guys were excellent in helping me sort everything out. The drop springs are great too! I highly recommend
Anonymous
Swift Spec-R Lowering springs Jeep Grand Cherokee 2011-2021
100/100! perfect CF crafted cold air intake for 6
100/100! perfect CF crafted cold air intake for 6.4 jeep .. even makes my AWE exhaust sound even deeper and you cam here this thing sucking when accelerating even at normal speeds🥶
srt.boizzz
Legmaker 392 TH Short Ram Jeep Grand Cherokee SRT 2012-2021
