This listing is for a factory replacement camshaft and lifter kit for the following GM models 2010-2013 Chevrolet GMC Sierra 1500 Silverado 1500 Suburban 1500 Tahoe Yukon Yukon XL 1500 using the 5.3L Vortec Series V-8 engine with Active Fuel Management (AFM). If the 8th digit in your VIN number in lower driver side dash is a “3” “0” or “7”, this is the right cam for your vehicle. USA-Manufactured Camshaft (Melling or Elgin) (8) Elgin (manufactured by Delphi) AFM Hydraulic Roller Lifters – NEW DESIGN; 2nd generation (8) Elgin (manufactured by Delphi) Hydraulic Roller Lifters (non-AFM). NOTE: Ordering this item will require a signature confirmation upon delivery. Please ship to an address where a signature can be obtained from UPS. AFM lifters fail due to a faulty VLOM (valley cover) – Updated VLOM# 12571609 from GM must be installed with new lifter to prevent future failures and warranty coverage.