Product Description
S&S Diesel LMM-400SAC-SET 400% Over Injector (NEW) — 2007.5–2010 GM Duramax 6.6L LMM
Built for competition-level fueling, this brand-new 400% over injector set from S&S Diesel Motorsport uses SAC nozzles and OE-level assembly/calibration for precise delivery and extreme flow potential. Ideal for high-horsepower drag, dyno, or sled pull LMM builds with the supporting air, fuel, and tuning.
Fitment
- 2007.5–2010 Chevrolet Silverado/GMC Sierra 2500HD/3500HD with 6.6L Duramax LMM
- Direct LMM application; NOT for LB7/LLY/LBZ/LML/L5P
What’s Included
- (8) Brand-new S&S Diesel Motorsport LMM injectors — 400% over (SAC nozzle)
- Set is flow-matched and balanced for consistent performance
- New components and seals as provided by S&S
Recommended Supporting Parts (CPP Internal Links)
- Duramax Injectors / Nozzles Category — compare supporting injector hardware and accessories.
- Duramax Fuel System Components — lift pumps, filtration, rails, regulators, and lines for high-flow builds.
- Shop All S&S Diesel at CPP — pair with S&S CP3 options and fueling upgrades.
- S&S CP3-DMX-LBZ/LMM (NEW) — a proven CP3 foundation for serious LMM fueling.
Important Notes
- Tuning and significant supporting mods required (airflow, fuel supply, driveline).
- Competition-use focus; verify emissions regulations applicable to your use.
- Core and warranty policies follow manufacturer terms.
FAQ
Are these injectors truly brand new?Yes. This specific listing is for a NEW set (not reman). S&S also offers reman options separately.
What horsepower level can 400% over injectors support?They are sized for advanced competition builds. Final power depends on turbo(s), pump capacity, fuel quality, tuning, and drivetrain.
Do I need a CP3 upgrade or dual pumps?At 400% over, a high-capacity CP3 (or dual CP3s), robust lift pump, and upgraded lines/filtration are strongly recommended.
Will these fit other Duramax generations?No. This set is engineered for the 2007.5–2010 LMM platform only.
