Product Description
S&S Diesel LLY-450SAC-SET 450% Over Injector Set (NEW) — 2004.5–2005 GM Duramax 6.6L LLY
Built for maximum fuel delivery on the LLY platform, this brand-new S&S Diesel Motorsport injector set uses SAC nozzles and tight flow balancing for consistent, high-output performance. Designed for dedicated performance builds where proper air, fuel supply, and calibration are in place.
Fitment
- 2004.5–2005 Chevrolet Silverado 2500HD/3500 6.6L Duramax LLY
- 2004.5–2005 GMC Sierra 2500HD/3500 6.6L Duramax LLY
- Engine code: LLY 6.6L Duramax (mid-2004 changeover through 2005)
What’s Included
- Eight (8) brand-new S&S Diesel Motorsport LLY injectors — 450% over (SAC nozzle)
- Flow-matched set for consistent cylinder-to-cylinder delivery
- New sealing washers and O-rings (as provided by manufacturer)
- Documentation / install notes
Recommended Supporting Parts
- Shop All S&S Diesel at CPP
- Duramax Injector Category
- Fuel System Upgrades — lift pump, filtration, and lines to support high-flow injectors
- 2001–2007 Duramax (LB7/LLY/LBZ) Platform Parts
- Tuners & Programmers — required for proper calibration on 450% sets
Installation & Notes
- Calibration required: 450% over injectors demand professional tuning and appropriate airflow (turbo/boost) and fuel supply.
- Competition use: Intended for off-road/competition builds where permitted. Verify local regulations.
- Use quality lift pump and high-efficiency filtration to protect injectors.
FAQ
Are these injectors brand-new or remanufactured?This listing is for a brand-new set (LLY-450SAC-SET). S&S also offers reman options in the LLY lineup.
Do I need tuning for 450% over injectors?Yes. 450% over injectors require professional calibration, adequate turbo airflow, and a robust lift pump/fuel system.
What nozzle style do these use?SAC-style nozzles with S&S’s proprietary honing and tight flow matching.
Will these fit all 2004 models?They fit mid-year 2004.5 LLY through 2005. Early 2004 LB7 trucks require LB7-specific injectors.
