Product Description
Improve reliability and coolant flow on your Duramax with the WEHRLI CUSTOM FAB WCF100420 LBZ/LMM DURAMAX THERMOSTAT HOUSING KIT. Designed specifically for the 2006-2010 Duramax LBZ and LMM engines, this upgrade replaces the restrictive factory thermostat housing with a stronger, high-flow fabricated solution engineered for performance builds.
The Wehrli Custom Fab thermostat housing kit improves coolant routing and durability while supporting larger turbo systems, aftermarket piping, and custom engine bay configurations. Precision-machined components and high-quality materials ensure long-term reliability whether your Duramax is built for towing, racing, or high horsepower street performance.
Hidden SEO Tags: LBZ Duramax thermostat housing upgrade, LMM coolant housing kit, Wehrli Custom Fab cooling upgrade, Duramax performance cooling system parts, LBZ LMM cooling system improvement kit, Duramax high flow thermostat housing upgrade.
Key Features
- Direct upgrade for 2006-2010 Duramax LBZ and LMM engines
- Improves coolant flow efficiency
- High-quality fabricated aluminum housing design
- Stronger and more durable than factory thermostat housing
- Ideal for performance Duramax builds with upgraded turbos
- Precision machined mounting surfaces for proper sealing
- Designed and manufactured by Wehrli Custom Fabrication
Fitment
- 2006 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LBZ
- 2007 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LBZ
- 2007.5-2010 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LMM
- 2006 GMC Sierra 2500HD / 3500HD 6.6L Duramax LBZ
- 2007 GMC Sierra 2500HD / 3500HD 6.6L Duramax LBZ
- 2007.5-2010 GMC Sierra 2500HD / 3500HD 6.6L Duramax LMM
Frequently Asked Questions
What does the thermostat housing upgrade improve?
This upgrade improves coolant flow efficiency and durability compared to the factory housing, helping maintain consistent engine temperatures on high performance Duramax builds.
Is this a direct bolt-on replacement?
Yes. The Wehrli WCF100420 thermostat housing kit is designed as a direct replacement for the factory unit on LBZ and LMM Duramax engines.
Does the kit include thermostats?
The kit focuses on upgrading the thermostat housing itself. Factory or upgraded thermostats may be reused or installed separately depending on your build.
Is this upgrade necessary for performance builds?
Many Duramax owners upgrade the thermostat housing when installing larger turbo kits, custom intercooler piping, or high horsepower engine builds to improve cooling system reliability.
Will this fit both LBZ and LMM engines?
Yes. The WCF100420 kit is designed specifically for both 2006-2007 LBZ and 2007.5-2010 LMM Duramax engines.
Specifications for WEHRLI CUSTOM FAB WCF100420
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100420 |
| UPC | Not Listed by Manufacturer |
| GTIN | Not Listed |
| Shipping Weight | Approximately 5 lbs |
| Package Dimensions | 10 x 8 x 6 inches |
| Shipping Method | UPS / FedEx Ground |
| Prop 65 Warning | This product may contain chemicals known to the State of California to cause cancer or reproductive harm. For more information visit https://www.P65Warnings.ca.gov |
