Engineered specifically for 2004.5 through 2010 Chevrolet Silverado and GMC Sierra 2500HD/3500 trucks powered by the 6.6L Duramax V8 turbo diesel engine (LLY, LBZ, and LMM codes), the PPE Release Valve Shim Kit (Part # 113072000) provides a cost-effective mechanical solution for age-weakened factory pressure relief valve (PRV) springs. Under full-throttle acceleration, heavy towing, or custom tuning, factory PRV springs fatigue and unseat prematurely, dumping high-pressure fuel back to the tank and tripping P0087 or P1093 low rail pressure codes.

Instead of completely blocking off the relief port, the PPE shim kit increases the spring preload pressure required to unseat the factory valve. This keeps available fuel rail pressure high under demanding loads while retaining factory-equipped safety pressure relief functionality. Fully CARB compliant (EO # D-701-32), this kit installs easily with zero core charge.

Key Features & Benefits

• Revitalizes Factory PRV Tension: Increases pop-off spring threshold pressure on age-weakened factory relief valves.
• Eliminates Low-Pressure Codes: Cures troublesome P0087 and P1093 low rail pressure diagnostic trouble codes (DTCs) during power enrichment.
• Retains Factory Safety Function: Preserves the built-in mechanical safety relief feature of the stock valve rather than fully plugging the rail.
• 50-State CARB Legal: Certified compliant under California Air Resources Board Executive Order # D-701-32.
• Zero Core Charge: Brand-new outright performance service kit requiring no core deposit or core return shipping.

Technical Specifications

• Manufacturer / Brand: Pacific Performance Engineering (PPE)
• Manufacturer Part Number / SKU: 113072000
• Product Type: Factory Pressure Relief Valve (PRV) Shim Kit
• Material Composition: High-Precision Hardened Steel Shims
• Emissions Status: 50-State CARB Compliant (Executive Order # D-701-32)
• Truck Compatibility: 2004.5–2010 GM Duramax (LLY, LBZ, LMM) & 2008–2010 Dodge Ram 6.7L Cummins
• Core Requirement: None
• Warranty: PPE Limited 1-Year Warranty

Vehicle Fitment & Technical Installation Notes

• 2004.5–2005 GM 2500HD / 3500 Duramax 6.6L (LLY)
• 2006–2007 GM 2500HD / 3500 Duramax 6.6L (LBZ Classic)
• 2007.5–2010 GM 2500HD / 3500 Duramax 6.6L (LMM)
• 2008–2010 Dodge Ram 2500 / 3500 / 4500 / 5500 6.7L Cummins
• Installation Tip: Relieve all high-pressure fuel system residual pressure completely before unthreading the factory relief valve. Disassemble the stock relief valve carefully on a clean workbench, insert the recommended number of shims (typically two shims for optimal performance) into the valve assembly, and torque back into the fuel rail to factory specifications.