Keep your Duramax diesel engine running smoothly with this comprehensive bearing kit designed for 2001-2024 Chevy GMC 6.6L models. This 4-pound package includes standard journal size main bearings, rod bearings, and thrust bearings specifically engineered for crankshafts with standard size journals. Critical installation note: these bearings are exclusively compatible with connecting rods marked with an 'B' - not suitable for 'A' marked rods, as GM occasionally mixed rod types in these engines. Compatible with multiple Duramax variations including LB7, LBZ, LGH, LLY LML, and LMM models. Before installation, carefully verify all your connecting rods have the 'A' marking to ensure proper fitment. This complete bearing set provides the essential components needed for proper engine maintenance and rebuilding.