BD Diesel rail pressure relief kits are an inexpensive way to allow for adjustments of the rail pressure relief valves on Duramax LLY/LBZ engines. These handy fuel rail relief valve shim kits include genuine Bosch shims.
Common Rail Fuel Relief Valve Shim Kit - Chevy 2004.5-2009 LLY/LBZ/LMM Dodge 2008-2010 6.7L