GM 5.3 & 6.0 lifter kit – All lifters, Active fuel management and regular roller lifters.;

GM 5.3 & 6.0 lifter kit - All lifters, Active fuel management and regular roller lifters. All items packaged by Enginetech. 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.