Product Description
S&S Diesel LMM-300SAC-SET 300% Over Injector (NEW) — 2007.5–2010 GM Duramax 6.6L LMM
Built for serious fuel delivery, the S&S Diesel Motorsport LMM-300SAC-SET is a brand-new set of eight injectors with 300% over SAC-style nozzles. Each set is balanced to tight tolerances for consistent performance under high load and RPM.
- Brand-new injector bodies (not cores), set of 8.
- EDM/honed SAC nozzles sized to 300% over stock, flow-matched per set.
- Competition-level fueling capacity; tuning and supporting mods strongly recommended.
Fitment
- 2007.5–2010 Chevrolet Silverado/Sierra 2500HD/3500HD
- 6.6L Duramax LMM
What’s Included
- (8) S&S Diesel Motorsport LMM 300% Over Injectors — NEW
- Installed 300% SAC nozzles, flow-matched set
- Documentation / install notes
Recommended Parts & Categories
- Shop All S&S Diesel at CPP
- S&S LMM-300SAC-R-SET (Reman) — Alternative Option
- Fuel Injectors Category
- Duramax Parts Category
FAQ
Are these injectors truly brand-new?Yes. LMM-300SAC-SET denotes a NEW set (not reman). S&S also offers reman options under different part numbers.
Do I need custom tuning?Absolutely. 300% over injectors require proper calibration and supporting upgrades (air, fuel supply, and drivetrain) for safe operation.
What’s the difference between SAC and VCO nozzles?SAC nozzles use a sac volume at the tip and are commonly chosen for high-flow, competition applications. They support more fuel vs. comparable VCO designs.
Will these work on a stock turbo and pump?Not recommended. At 300% over, you should plan on upgraded turbo(s), lift pump, and sufficient high-pressure fuel system capacity.
Is there a core charge?New sets typically do not require a core, but some retailers list core handling for certain configurations. Check your order details at checkout.
Notes
- Intended for competition/off-road builds where allowed. Verify local laws.
- Professional installation and post-install calibration are strongly recommended.
