Product Description
Improve the durability and reliability of your L5P Duramax cooling system with the WEHRLI CUSTOM FAB WCF100742 UPPER COOLANT PIPE KIT. Designed specifically for 2017-2019 6.6L Duramax trucks, this upgrade replaces the factory plastic upper coolant pipe with a precision-fabricated aluminum solution that provides superior strength and long-term reliability.
The factory L5P coolant pipe is known to weaken over time from heat cycles and engine vibration. Wehrli Custom Fabrication engineered the WCF100742 Upper Coolant Pipe Kit to eliminate that weak point by using high-quality aluminum tubing and durable silicone couplers. The result is a clean, high-performance coolant routing solution capable of handling increased heat and pressure in stock or modified Duramax trucks.
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Key Features
- Direct replacement for factory upper coolant pipe
- Heavy-duty aluminum construction
- Improved durability compared to factory plastic pipe
- High-temperature silicone couplers included
- Designed specifically for 2017-2019 L5P Duramax trucks
- Clean engine bay appearance
- Built by Wehrli Custom Fabrication
Fitment
- 2017 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax L5P
- 2018 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax L5P
- 2019 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax L5P
- 2017 GMC Sierra 2500HD / 3500HD 6.6L Duramax L5P
- 2018 GMC Sierra 2500HD / 3500HD 6.6L Duramax L5P
- 2019 GMC Sierra 2500HD / 3500HD 6.6L Duramax L5P
Installation Note: This kit installs in place of the factory upper coolant pipe and is designed as a direct bolt-in upgrade using factory mounting points.
Frequently Asked Questions
Why upgrade the factory coolant pipe?
The factory pipe is plastic and can weaken over time due to heat cycles and vibration. The Wehrli aluminum pipe improves durability and reliability.
Does this kit require tuning?
No tuning is required. This is a mechanical reliability upgrade for the cooling system.
Is installation difficult?
Installation is straightforward for most diesel technicians and experienced DIY owners using basic hand tools.
Will this work on modified trucks?
Yes. This coolant pipe upgrade works on both stock and performance-modified L5P Duramax trucks.
Does this improve cooling performance?
The primary benefit is durability and reliability, though improved coolant flow stability can help support performance applications.
Specifications for WEHRLI CUSTOM FAB WCF100742
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100742 |
| UPC | Not Listed by Manufacturer |
| GTIN | Not Listed |
| Shipping Weight | Approximately 4 lbs |
| Package Dimensions | 18 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 |
