Product Description
MAHLE 41909 Piston Ring Set (Standard Bore) for the 2001–2010 GM 6.6L Duramax (LB7, LLY, LBZ, LMM). OE-quality, pre-lapped rings designed for fast seating, reliable compression, and controlled oil consumption.
- Application: 6.6L Duramax V8 (STD bore ~4.055"/103 mm)
- Top ring: ductile iron, plasma-moly face; 3.0 mm
- Second ring: cast iron, chrome face; 2.0 mm
- Oil control ring: stainless steel, gas-nitride; 3.0 mm
- Sold as a complete engine set; pre-lapped for immediate seating
- GTIN/UPC: 027067460783
Fitment
- 2001–2004 LB7, 2004.5–2005 LLY, 2006–2007 LBZ, 2007.5–2010 LMM
- Vehicles: Silverado/Sierra 2500HD & 3500HD; Express/Savana 2500/3500 (select years); Kodiak C4500/C5500 & TopKick C4500/C5500 (2003–2009)
Cross Reference & Related
- MAHLE: 41909 (STD), 41909.01 (.010), 41909.02 (.020), 41909.03 (.030), S41909
- GM OE (single-piston ring set): 97386951 (verify application/quantity)
FAQ
Will these rings fit all 2001–2010 Duramax engines?
Yes—they cover LB7, LLY, LBZ, and LMM 6.6L engines. Always confirm bore size before ordering.
Do I need a break-in period?
Minimal—these rings are pre-lapped to seat quickly when installed with proper honing and clearances.
Are these standard bore?
Yes—this listing is for STD bore (~4.055"). Oversizes (.+010, .+020, .+030) are available under the related MAHLE numbers above.
What hone finish should I use?
Follow MAHLE’s recommended plateau hone and OEM surface finish specs for best sealing and oil control.
