Product Description
S&S Diesel LLY-250SAC-SET 250% Over Injector Set (NEW) — 2004.5–2005 GM Duramax 6.6L LLY
Serious LLY fueling for competition builds. This brand-new S&S Diesel Motorsport injector set uses SAC nozzles and OE-standard calibration to deliver ~250% over stock flow with tight set-to-set consistency—ideal for high-output LLY combinations when supported by proper airflow and tuning. Set of 8, new bodies. (Specs and LLY lineup on S&S site.)
- SAC nozzles with proprietary honing for clean, consistent orifices.
- Nozzles flow-matched to ~1% per set, injectors flow-matched to ~3% per set under OE-like test conditions.
- Internal body mods on 250%+ sizes to improve injection rate shape.
- Built and calibrated on genuine Bosch equipment.
Fitment
2004.5–2005 Chevy Silverado / GMC Sierra 2500HD & 3500HD with 6.6L Duramax LLY. Set of 8 (NEW).
What’s Included
- (8) S&S Diesel Motorsport LLY 250% over injectors (new)
- Pre-calibrated, flow-matched set with data/specs from S&S
Recommended Supporting Parts
- GM Duramax Injectors & Nozzles (Category) — compare injector options and related hardware for LLY builds.
- AirDog II-5G DF-165 Lift Pump (01–10 Duramax) — stable supply pressure/volume to support high-flow injectors.
- Shop All S&S Diesel at CPP — complementary fuel system components and accessories.
Helpful Notes
- Intended for competition/off-road builds; custom tuning is required to utilize 250% flow safely.
- Upgrade airflow (turbo, intercooler) and lift-pump supply to match the added fuel.
- Verify local emissions regulations before purchase/use.
FAQ
Are these injectors brand-new or reman?This listing is for a new set of 8 injectors (LLY-250SAC-SET). Reman variants exist separately.
Do I need a lift pump with 250% injectors?Yes—large injector sets benefit from a quality lift pump to maintain rail supply under load; see our recommended AirDog option above.
How tightly are these matched?Nozzles are typically matched to ~1% per set and injectors to ~3% per set using OE-like test standards, improving balance and drivability.
Will these fit my 2006 LBZ?No—this set is specific to the 2004.5–2005 LLY platform. Check our Duramax category for LBZ options.
