INDUSTRIAL INJECTION 0986435504SE-R4 GM REMANUFACTURED INJECTOR - 2004.5-2005 6.6L DURAMAX LLY - 29 LPM (R4 "¢ 50% OVER)

Feed your LLY the fuel it needs. The Industrial Injection 0986435504SE-R4 is a 50% over (R4) remanufactured Bosch-based injector that flows ~29 LPM for serious street/strip and work builds. Precision honed and balanced for clean delivery under boost.

Fitment

• 2004.5-2005 GM 6.6L Duramax LLY (Silverado/Sierra 2500HD/3500HD)
• Direct replacement sizing and connections; tuning and supporting air/fuel mods recommended for 50% over flow

What's Included

• (1) Remanufactured 29 LPM (R4 • 50% over) injector
• New seals installed (core charge may apply-see cart)
• Sold individually; order 8 for a full set

Key Features

• ~29 LPM flow (R4) to support larger turbo/CP3 combinations
• OE-grade reman process on Bosch bodies with precision flow matching
• 1-year, unlimited-mileage warranty from Industrial Injection
• Drop-in fit for LLY harness/rails with proper calibration

Recommended Parts (CPP Internal Links)

• Injector Installation Kit (2004.5-2010 Duramax)
• Injector Return Line Kit - Industrial Injection (LLY/LBZ/LMM)
• High-Pressure Injection Line Kit - Fleece (LLY)
• S&S 10mm CP3 High-Pressure Pump (LB7/LLY/LBZ)
• ARP 230-4201 Head Stud Kit (LB7/LLY/LBZ/LMM)
• Shop All Duramax Injectors & Nozzles

Cross-Reference / Alternatives (LLY • Internal Links)

• Stock Flow: 0986435504SE-IIS
• R1 • 23 LPM
• R2 • 25 LPM
• R3 • 27 LPM
• R5 • 33 LPM
• R6 • 38 LPM

Helpful Notes

• LLY trucks with 50% over injectors benefit from upgraded turbo and CP3 plus proper tuning to control smoke/EGTs.
• Always replace sealing washers and inspect/refresh return lines during injector service.

FAQ

Power depends on air (turbo/intercooling), CP3 supply, and tuning. As a rule, R4 50% over injectors are aimed at strong street/strip setups where a larger turbo and healthy CP3 are in place.

Yes. Calibrations must be updated for 50% over flow to maintain drivability, rail pressure control, smoke, and EGTs.

No. Always install matched sets by flow; mixing different LPM injectors can cause imbalance, smoke, and rough running.

At minimum: install kit (seals/washers), return line kit, and inspect/replace high-pressure lines. Verify CP3 health and fuel filtration.