Product Description
S&S Diesel LLY-300SAC-SET 300% Over Injector Set (NEW) — 2004.5–2005 GM Duramax 6.6L LLY
For all-out LLY builds, the S&S Diesel Motorsport LLY-300SAC-SET delivers massive fuel with brand-new bodies and SAC nozzles that are precision honed and flow-matched for consistency across the set. S&S calibrates on genuine Bosch equipment and aligns injection profiles for stable control at high output. Competition use only; proper air and fuel system support required. Sources: S&S product listings and dealer pages for LLY injectors and 300% sets.
Fitment
- 2004.5–2005 Chevrolet Silverado/GMC Sierra 2500HD & 3500HD — 6.6L Duramax LLY.
- Set of 8 brand-new injectors, 300% over stock SAC nozzles.
What’s Included
- (8) S&S Diesel Motorsport LLY-300SAC-SET brand-new injectors (SAC nozzle, 300% over).
- Flow-matched set; calibration on Bosch equipment; documentation.
- Core policy depends on dealer/program; verify at checkout.
Recommended Supporting Parts
- Duramax Injectors / Nozzles Category — browse complementary LLY injector hardware and options at CPP.
- FASS Fuel Systems & Parts — Duramax to maintain steady supply and filtration on high-flow builds.
- Shop All S&S Diesel at CPP — pumps and fueling components that pair with big-injector LLY combos.
Installation Notes
- Designed for competition builds; adequate turbo/airflow, lift pump, and tuning are required.
- Professional installation and post-install validation recommended.
FAQ
Is tuning required with 300% over injectors?Yes. Injectors at this size demand appropriate ECM calibration along with matching air and fuel system upgrades to maintain control and reliability.
Are these new or remanufactured?This listing is for a brand-new set (NEW). CPP also carries reman options and other sizes if you need a different combo.
Do I need a lift pump?Highly recommended. A quality lift pump and filtration (e.g., FASS for 2001–2010 Duramax platforms) help protect injectors and stabilize supply at higher demand.
What trucks does this fit?2004.5–2005 Chevy Silverado and GMC Sierra 2500HD/3500HD with the 6.6L Duramax LLY engine.
