Product Description
S&S Diesel LMM-300SAC-R-SET 300% Over Injector (Reman) — 2007.5–2010 GM Duramax 6.6L LMM
Build a competition-ready LMM with a matched set of eight remanufactured 300% over S&S Diesel injectors. Precision SAC nozzles and OE-grade processes deliver the fuel needed for big turbo(s), dual/stroker CP3 setups, and custom tuning.
Fitment
- 2007.5–2010 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD — 6.6L Duramax LMM
- Set of 8 remanufactured common-rail injectors; 300% over stock flow
- Intended for competition/off-road builds with adequate air and fuel supply
What’s Included
- (8) S&S Diesel reman injectors — LMM-300SAC-R-SET (matched set)
- Balanced flow set with SAC nozzles
- Core return required (typical for reman injector sets)
Recommended Supporting Parts
- GM Duramax Injectors & Nozzles (Category) — compare injector options and components.
- GM Duramax Fuel Lift Pumps (Category) — stabilize supply pressure for high-flow builds.
- Exergy 10mm Stroker CP3 (LMM) — proven high-pressure supply for large injectors.
- Shop All GM Duramax (LB7–L5P) — gaskets, lines, sensors, and install hardware.
- Shop All S&S Diesel at CPP — injectors, pumps, filtration, and more.
Helpful Notes
- Custom tuning is mandatory for 300% over injectors.
- Pair with adequate turbo(s) and high-flow CP3 (dual or stroker) plus a quality lift pump and filtration.
- Fuel contamination kills injectors — use proper filtration and clean install practices.
FAQ
Are 300% over injectors streetable on a stock turbo?No. These are competition-level injectors that require significant airflow (larger turbo(s)) and custom calibration to operate correctly.
Do I need a lift pump and upgraded CP3?Yes. A high-quality lift pump and a dual or stroker CP3 are strongly recommended to maintain rail pressure and reliability under load.
What nozzle style do these use?SAC-style performance nozzles sized 300% over stock, matched as a set for consistent flow.
Is tuning required after installation?Absolutely—custom tuning is required to properly command fueling and timing with 300% over injectors.