S&S Diesel 12mm Stroker CP3 High-Pressure Fuel Pump (CP3-DMX-12)

Unlock serious single-pump performance with the S&S Diesel 12mm Stroker CP3. Built from a brand-new Bosch LBZ-based pump (not remanufactured), this unit delivers a 46% increase in displacement over stock LBZ pumps with a displacement of 1,590 mm³/rev. It is engineered to support 1,000+ horsepower applications while maintaining consistent rail pressure well beyond the point where stock CP3 pumps begin to fall off.

Key Features

• 12mm Stroker Design — Significantly increased displacement for the fuel volume demanded by high-performance injectors and aggressive calibrations
• High-RPM Capability — Internally modified to eliminate the flow restrictions that typically limit stock CP3 pumps above ~3,000 RPM, with strong fueling support through 4,500+ RPM
• Brand-New Construction — Fresh LBZ-based pump with LBZ fuel pressure regulator for maximum durability and reliability
• Single-Pump Power — Capable of supporting four-digit horsepower levels when paired with proper supporting modifications
• No Core Charge — Brand-new unit; no core return required

Fitment

• 2001–2010 GM Duramax 6.6L (LB7, LLY, LBZ, LMM)
• Also suitable for LML CP3 conversion applications (tuning may be required)

Important Notes

• Custom tuning is required on 2001–2005 LB7 and LLY engines
• LB7 installations require modification of the regulator connectors for proper fitment
• A quality lift pump (150 GPH or higher recommended) is strongly advised for maximum performance

This is one of the most proven single-CP3 solutions available for serious Duramax builds that need reliable high-volume fuel delivery without the complexity of dual-pump setups.