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Wehrli 04.5-2010 Duramax LLY/LBZ/LMM Crankcase Vent (PCV) Fitting Kit - Billet Black Anodized
Wehrli Billet PCV Crankcase Vent Fitting Kit — Black Anodized for 2004.5-2010 Duramax LLY/LBZ/LMM
Upgrade your Duramax's crankcase ventilation system with the Wehrli Custom Fabrication Billet PCV Fitting Kit in Black Anodized. Designed for the 2004.5-2010 LLY, LBZ, and LMM Duramax engines, this precision-machined billet aluminum fitting kit replaces the factory plastic PCV fittings that are known to crack and fail over time — particularly on tuned or high-performance diesel builds. Wehrli's billet fittings provide a leak-free, durable solution with a premium black anodized finish that looks excellent under the hood.
Key Features
- CNC-machined from billet aluminum — far superior to OEM plastic fittings
- Black anodized finish for corrosion resistance and premium appearance
- Covers LLY (2004.5-2005), LBZ (2006-2007), and LMM (2007.5-2010) Duramax engines
- Eliminates the risk of PCV fitting cracking and boost/oil leaks
- Direct replacement — bolt-on fitment using factory mounting points
- Ideal for tuned trucks and high-boost applications where factory fittings fail
Why Factory PCV Fittings Fail on Duramax
On tuned and modified LLY, LBZ, and LMM Duramax trucks, increased crankcase pressure puts additional stress on the factory plastic PCV fittings. These OEM parts are prone to cracking, resulting in oil leaks and crankcase ventilation issues. Wehrli's billet aluminum kit solves this problem permanently with machined hardware that handles elevated pressure without failure.
Fitment: 2004.5-2010 Duramax LLY / LBZ / LMM
Part Number: WCF100189
Brand: Wehrli Custom Fabrication (WCFab)