I just completed my step by step videos for deleting the AFM/DOD on my 2015 Yukon Denali 6.2L L86. It’s virtually the same process for the 5.3L L83. Hopefully this video series is helpful to others
DOD AFM Delete Yukon, Tahoe, Silverado, Sierra, Escalade L86 & L83 Part 1 Disassembly cam lifters