Goldie, my 2007 Ebay truck with 189K I purchased some parts and let someone else to install them, my fault for this failure. When I checked the lifters I found that the new lifters I purchased and installed are 2/16 shorter than the originals, so this was the ticking I just listen to for the last 2,000 miles. Hope the cam isn't tosted from it. Question, are there 2 part numbers for the AFM/DOD lifters?