Wehrli Custom Fabrication WCF100366-BS WCFab x D&J Precision Billet Valve Cover Blue Smoke 5.9L 6.7L Cummins

The Wehrli Custom Fabrication WCF100366-BS is a premium billet valve cover built in collaboration with D&J Precision Machine, finished in Blue Smoke powder coat. Designed as a direct replacement for the factory valve cover on 2006–2024 5.9L and 6.7L Cummins diesel engines, this cover delivers a significant upgrade in both durability and crankcase ventilation performance.

The stock Cummins valve cover's ventilation system can be insufficient under heavy-duty or high-performance use, leading to elevated crankcase pressure, blow-by, and oil leaks. The WCFab billet cover addresses these shortcomings with an advanced baffled breather system featuring multiple vent ports and improved internal baffling that separates oil mist from blow-by gases for cleaner, more effective venting.

Key Features:

• Aircraft-quality 6061-T6 billet aluminum construction — excellent strength-to-weight ratio, corrosion resistance, and high-temperature durability
• Baffled breather system — manages higher crankcase pressures and reduces blow-by contamination
• Blue Smoke powder coat finish — durable, show-quality color with lasting protection
• Includes WCFab engraved billet cap
• Includes D&J Precision custom billet breather
• Includes all stainless steel fasteners and a 3/4-inch hose
• Made in the USA
• Not CARB approved — not for sale or use in California

Whether you're running a hard-working stock-displacement Cummins or a modified high-performance build, the WCF100366-BS billet valve cover protects your engine while adding a custom, professional appearance under the hood. Manufacturer Part Number: WCF100366-BS.