19/10/2026
GM Duramax 6.6L Valve Cover & Gasket Across Generations
How have GM Duramax 6.6L valve covers and gaskets changed from LB7 to L5P? Explore the evolution across LB7, LLY, LBZ, LMM, LML, and L5P engines - from improved fuel injector access to acoustic treatment for reduced engine noise.
Learn about LB7 valve cover gaskets, bolt grommets, and fuel injector nozzle seals, plus the upper and lower valve-cover sealing arrangements used in later generations.
Looking for Duramax valve cover gaskets for your GM Duramax? Contact to find sealing solutions for your engine application, or visit us at SEMA Show 2026.