Product Description
MAHLE VS50550 is an OE-quality valve cover & lower rocker cover gasket set for the 2004.5–2007 GM 6.6L Duramax LLY/LBZ. Manufactured to meet strict OE specs, this molded rubber set restores a clean, leak-free seal at the upper covers and rocker boxes. One kit services one engine.
- Engine: 6.6L Duramax (LLY 2004.5–2005, LBZ 2006–2007)
- Construction: Molded rubber, OE-style
- Use: Reseals upper valve covers and lower rocker/valve cover interface
- Quantity: One kit required per engine
Fitment
- 2004.5–2005 Chevrolet/GMC 2500HD & 3500HD – 6.6L Duramax LLY
- 2006–2007 Chevrolet/GMC 2500HD & 3500HD – 6.6L Duramax LBZ
- Also used on select Express/Savana vans & Kodiak/TopKick—verify by VIN/engine RPO.
Cross Reference Numbers
- GM Upper Valve Cover Gasket: 97312341 (LLY/LBZ/LMM family)
- GM Lower Rocker Cover Gasket: 97321295 (LLY/LBZ/LMM/LML family)
What’s Included
Valve cover and lower rocker cover gaskets. Some retailers note injector seals and RTV may be included depending on kit batch—inspect tray on arrival.
FAQ
Will this fit my 2004.5–2007 Duramax?
Yes—this set covers LLY (’04.5–’05) and LBZ (’06–’07) 6.6L trucks. Confirm RPO and VIN before ordering.
Does it include injector seals and RTV?
Contents can vary by batch; some listings indicate seals/RTV. Check the physical kit upon receipt.
How many kits do I need?
One VS50550 services one engine.
Any install tips?
Clean mating surfaces thoroughly, torque per GM service manual, and replace grommets/bolts as needed for best sealing.
