Wehrli Custom Fabrication WCF100366-GB Billet Valve Cover for 5.9L/6.7L Cummins - Galaxy Blue

The Wehrli Custom Fabrication WCF100366-GB is a precision-engineered billet valve cover developed in collaboration with D&J Precision Machine, designed as a high-performance upgrade for 5.9L and 6.7L Cummins diesel engines. Finished in Galaxy Blue powder coat, this cover combines show-quality aesthetics with functional performance improvements over the factory valve cover.

Crafted from aircraft-quality 6061-T6 aluminum and CNC machined for exact fitment, this billet valve cover features a baffled breather system to help manage crankcase pressure and reduce oil mist. The collaboration with D&J Precision Machine brings a custom billet breather element included in the kit, elevating both form and function.

Key Features:

• Constructed from aircraft-grade 6061-T6 billet aluminum for maximum strength and durability
• Baffled breather system for improved crankcase ventilation
• Includes WCFab engraved billet cap
• Includes D&J Precision Machine custom billet breather
• All stainless steel fasteners included
• Includes 3/4-inch breather hose
• Galaxy Blue powder coat finish (suffix: -GB)
• Proudly made in the USA

The WCF100366-GB is a direct-fit replacement valve cover, delivering a clean, custom engine bay appearance alongside real-world performance benefits. WCFab is known throughout the diesel performance community for its precision manufacturing and industry-leading powder coat finish options, making this billet valve cover a top choice for Cummins diesel enthusiasts seeking both performance and style.