Product Description
S&S Diesel LB7-400SAC 400% Over Injector (New) — 2001–2004 GM Duramax 6.6L LB7
Maximum fueling for serious builds. The S&S Diesel Motorsport LB7-400SAC set uses a high-flow SAC nozzle design for extreme performance on 2001–2004 Duramax LB7 platforms. S&S flow-matches injectors to tight tolerances and builds them on OE-grade equipment for consistency and durability.
Fitment
- 2001–2004 Chevrolet Silverado/GMC Sierra 2500HD & 3500HD with 6.6L Duramax LB7
- Intended for competition/off-road builds where calibration and supporting mods are required
What’s Included
- Set of eight (8) brand-new S&S LB7-400SAC injectors (400% over)
- Flow-matched set built to S&S specifications
- Documentation and install notes
Recommended Supporting Parts
- LB7 Fuel Injectors Category (01–04)
- Duramax Fuel System Upgrades
- Tuners & Programmers
- Air Intakes & Filters
- Exhaust Systems
Installation & Notes
- Professional installation and custom calibration are strongly recommended for 400% over injectors.
- Emissions compliance: competition use only unless you verify local regulations.
- Core policy may apply depending on product variant; verify during checkout.
FAQ
**Are these sold as a set or individually?**LB7-400SAC is typically listed as a set of 8 new injectors for 2001–2004 LB7 applications.
**Do I need tuning for 400% over injectors?**Yes. Injectors at this size require matching calibration and adequate air/fuel system support.
**What nozzle style do these use and why does it matter?**They use SAC-style nozzles, which are preferred for durability and high-flow performance compared to the stock VCO design on LB7.
**Will these fit my 2003 LB7 2500HD?**Yes—these are built for 2001–2004 GM 2500HD/3500HD with the 6.6L Duramax LB7.
