Product Description
S&S Diesel LLY-300SAC-R-SET 300% Over (Reman) Injector Set — 2004.5–2005 GM Duramax 6.6L LLY
Built for serious fuel demands. This remanufactured, flow-matched 300% over injector set uses SAC-style nozzles and Bosch-calibrated hardware for consistent delivery across all eight injectors. S&S specifies tight flow matching and nozzle honing practices to OE-level standards for dependable performance at competition power levels. Sources: S&S LLY injector program page and product category.
- Flow-matched injector sets; nozzles matched to ~1% and injectors to ~3% within the set. S&S LLY Duramax Injectors page.
- Proprietary nozzle honing for clean, consistent holes and aligned injection profiles. S&S LLY Duramax Injectors page.
- 300% over SAC nozzles sized for racing/competition with appropriate supporting mods. Dealer listings for LLY 300% sets.
Fitment
2004.5–2005 Chevrolet Silverado/GMC Sierra 2500HD & 3500HD with 6.6L Duramax LLY. S&S LLY Duramax Injectors (2004.5–2005).
What’s Included
- (8) Remanufactured S&S Diesel Motorsport injectors — 300% over, SAC nozzle
- Each injector calibrated on genuine Bosch equipment
- Flow/quality documentation as provided by manufacturer
Recommended Supporting Parts
- Exergy 10mm Stroker CP3 (LLY) — adds supply to match 300% injectors.
- DDP 60% Over LLY Injectors — alternative sizing for streetable builds.
- XDP LLY Stock-Style Reman Injector — maintenance/diagnostics & spares.
- S&S 400% Over LLY (NEW) — step up if you’re moving beyond 300%.
Installation & Notes
- Competition/“race use” orientation at this size; verify local regulations and intended usage. Some listings indicate shipping restrictions for California. Example dealer note.
- Expect to pair with upgraded turbo(s), stout CP3 (or dual CP3), and custom tuning.
- Core charge applies on reman sets; core policy varies by seller.
- Typical S&S injector warranty referenced by dealers is 2 years; confirm your seller’s policy.
FAQ
Is tuning required with 300% over LLY injectors?Yes. At 300% over, custom tuning is mandatory to control fueling and drivability with appropriate turbo and pump support.
What supporting mods are recommended?At minimum: upgraded or dual CP3 fuel supply, larger turbo(s), adequate lift pump/filtration, and a proven calibration. See our recommended parts above.
Are these legal for on-road street use?These are intended for competition/off-road builds. Check local and state regulations before purchase/installation; some vendors restrict shipping to certain states.
Is there a core charge on the reman set?Yes, reman sets typically require a refundable core deposit; the amount and process depend on the seller’s policy.
What’s the warranty?Dealers commonly advertise a 2-year S&S injector warranty—verify specifics with your order confirmation.
