Product Description
Dial in proper oil clearance after a crank grind with the MAHLE CB1990P50MM P-Series connecting rod bearing for 2001–2016 6.6L Duramax (LB7/LLY/LBZ/LMM/LML). Built on a hardened steel back with TM-77 tri-metal overlay, high crush, and engineered eccentricity, this .50 mm undersize “A-rod” shell delivers reliable oil film strength under heavy tow, work-truck heat cycles, and street/strip abuse.
Fitment
- 2001–2016 Chevrolet Silverado 2500/3500 HD — 6.6L Duramax (LB7, LLY, LBZ, LMM, LML)
- 2001–2016 GMC Sierra 2500/3500 HD — 6.6L Duramax (LB7, LLY, LBZ, LMM, LML)
- Also used in select Express/Savana fleet applications with 6.6L Duramax
- Intended for connecting rods stamped “A”
Cross-Reference / Alternatives (Mahle on CPP Diesel only)
Notes
Always measure journal size/roundness, confirm rod ID, and verify bearing-to-journal oil clearance. Mix/match sizes only as directed by your machinist.
FAQ
Will this fit my LB7/LLY/LBZ/LMM/LML?
Yes—CB-1990P shells fit 2001–2016 6.6L Duramax engines that use the “A” connecting rods. Verify your rod marking before ordering.
What does “.50 mm undersize” mean?
It’s for a crank journal ground 0.50 mm (≈0.020") under stock size to restore proper oil clearance.
Is this sold individually or as a set?
Sold per bearing shell. Order the quantity required for your engine (typically eight for a V8).
Specifications for Mahle CB1990P50MM
| Attribute | Value |
|---|---|
| Brand | MAHLE / Clevite (P-Series) |
| Part Number | CB1990P50MM (aka CB-1990P-.50MM) |
| Size | .50 mm undersize (≈ .020") |
| Engine Compatibility | 2001–2016 GM 6.6L Duramax (LB7/LLY/LBZ/LMM/LML); “A” rods |
| UPC | 27067971005 |
| GTIN | 00027067971005 |
| Shipping | Calculated at checkout; optional shipping insurance available |
| Prop 65 | This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Learn more |
