Product Description
Stop valve float and keep your 6.6L Duramax happy at higher boost and RPM. The Industrial Injection 44B801 130lb Performance Valve Spring Kit is engineered for 2001–2016 GM LB7/LLY/LBZ/LMM/LML platforms. It’s the proven upgrade when you’re leaning on the tune, pushing big boost, or spinning past stock limits.
- Prevents valve float for safer high-RPM operation
- Supports elevated boost builds (recommended for >45 psi and/or >3200 RPM)
- Complete kit: conical springs, billet steel retainers, chromoly spring seats, and valve locks
- Durable materials for long service life in performance use
Fitment
- 2001–2016 GM 6.6L Duramax: LB7, LLY, LBZ, LMM, LML
What’s Included
- Set of 130 lb conical valve springs
- Billet steel retainers
- Chromoly spring seats
- Valve locks
Recommended Parts
- ARP 230-4201 Head Stud Kit (ARP2000) — 01–16 Duramax
- ARP 230-4202 Head Stud Kit (625+)
- Performance Pushrods — Duramax
- Cylinder Head Gaskets & Upper Gasket Sets — Duramax
- Valve Springs & Retainers — Category
Helpful Notes
- Intended for performance applications exceeding stock boost/RPM thresholds.
- Professional installation recommended; verify installed heights and coil bind clearance.
Specifications
| Brand | Industrial Injection |
| MPN | 44B801 |
| Application | 2001–2016 GM 6.6L Duramax (LB7/LLY/LBZ/LMM/LML) |
| Seat Pressure | 130 lb (kit rating) |
| Spring Style | Conical |
| Retainers | Billet steel (included) |
| Spring Seats | Chromoly (included) |
| Valve Locks | Included |
| UPC | Not provided by manufacturer |
FAQ
Do I need this kit on a stock turbo and tune?
If you remain at stock boost and factory RPM limits, upgraded springs are typically not required. This kit is recommended once you push past ~45 psi boost and/or spin beyond ~3200 RPM.
Will these springs work with OEM retainers and locks?
No need—this kit includes billet retainers and valve locks matched to the springs for proper fitment.
Should I add head studs at the same time?
Yes. When upping boost and RPM, head studs are strongly recommended for reliability. See the ARP kits linked above.
Is machine work required?
Generally no. Always measure installed height and verify coil bind clearance; professional installation is advised.
