LBZ PCV Reroute Modification (6.6L Duramax Guide)
An LBZ PCV reroute modification is a popular reliability upgrade for 2006–2007 6.6L Duramax diesel trucks. It is designed to redirect crankcase vapors away from the intake system, helping reduce oil buildup inside the turbo, intercooler, and intake piping.
The LBZ Duramax is known for strong durability, but like many diesel engines, it still produces blow-by gases that carry oil mist. Over time, this oil can accumulate inside the intake system and reduce efficiency.
What Is an LBZ PCV Reroute Modification?
An LBZ PCV reroute modification changes the factory crankcase ventilation path. Instead of sending oil vapor back into the intake, the system redirects it through a hose to a safer vent location or catch can.
Typical setups include:
- Silicone reroute hoses
- Intake block-off caps
- Vent tubes routed to frame rail or catch can
- Optional filtration or oil separator systems
The goal is simple: keep oil vapor out of the intake system.
How the Factory PCV System Works
In stock form, the LBZ crankcase ventilation system routes blow-by gases into the intake so they can be burned again in combustion.
While this helps emissions compliance, it can also lead to:
- Oil coating inside intercooler pipes
- Turbo inlet contamination
- Intake manifold residue buildup
- Reduced airflow efficiency over time
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