Product Description
Unlock reliable, clean power on your LB7 with the Industrial Injection 0433175275-R4 extrude-honed injector nozzle. The RACE4 spec flows approximately 33 LPM (~50% over stock) for strong mid-range and top-end fueling while maintaining crisp atomization when paired with the right tune and supply.
Fitment
- 2001–2004 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD — 6.6L Duramax LB7
What’s Included
- (1) Extrude-honed injector nozzle — R4 / 33 LPM
- Sold individually (order 8 for a complete set)
Why It Works
- ~50% over stock flow supports significant horsepower gains with proper air and tuning
- OE-quality base nozzle, then precision extrude-honed and calibrated
- Improved atomization can help reduce EGTs when properly matched
Recommended Parts (CPP internal links)
- BD Diesel 1050141 LB7 Injector Install Kit
- DTECH DT660020 LB7 Fuel Return Line Kit
- Industrial Injection RTF26401 Injector & Return Washers (set for 4)
- Industrial Injection 412604 Return Line Banjo Bolt Kit (set of 8)
- Fleece PowerFlo In-Tank Lift Pump (LB7)
- Brand-New Stock CP3 for LB7 or 12mm High-Speed CP3 Upgrade (LB7/LLY/LBZ)
- Shop All Duramax Injectors & Nozzles
- Shop Duramax Lift Pumps
Cross-Reference / Alternatives (LB7 Nozzle Sizes)
Helpful Notes
- Have injectors balanced after nozzle install. Use new sealing washers, lines, and return hardware.
- Lift pump + healthy CP3 strongly recommended above stock fueling levels.
- Competition/off-road use may apply depending on calibration and local laws.
FAQ
How much power will R4 (33 LPM) support?On a well-matched LB7 with tuning, turbo, lift pump, and healthy CP3, R4 nozzles commonly support ~50% more fueling than stock. Actual horsepower depends on air system and tune.
Are these sold individually or as a set?They are sold individually. Order eight (8) for a complete set.
Do I need tuning?Yes. Any over-stock nozzle requires proper calibration to control pulse width, timing, and rail pressure.
What maintenance should I do during install?Replace sealing washers and return hardware, inspect injector lines, and prime with a quality lift pump to protect the CP3 and injectors.
