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This kit provides all the components to replace the lifters in the Hybrid GM 6.0 V-8 engines with Active fuel Management. It contains a cylinder head gasket set, all new head bolts and all new lifters, 8 AFM lifters and 8 non AFM lifters. Please check your vehicle ID number for proper fitment. The eight digit from the left indicates engine type. All Materials highest quality from Engintech. Failed AFM lifters are caused by incorrect VLOM engagement timing. Please replace your VLOM with GM# 12571609 when replacing you AFM lifters. Repeat failure is likely if this step is skipped.