Gm 5.3 AFM Lifter Replacement Kit. Head Gasket Set, Head Bolts,  Full Lifter Set. For 2005 - 2012 5.3 Active fuel management engines only. Send us your vin we will send your vehicles full RPO code breakdown PDF to ensure fitment Must install new updated solenoid plate (VLOM)# 12571609 for warranty coverage. Highest quality - Not sure it fits? Send us you vehicle ID number we will make sure! See additional features below for more information.