@GREMINGTON Here is a comment from the product listing of the kit you bought that has some helpful information that supports my theory:
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I rebuilt my 2011 Tahoe 5.3l flex and thought I would save you time to let you know what else you will need. If you are doing a 2007-2014 Chevy 5.3 this info is priceless.
*Earlier generation timing cover.
*Camshaft position sensor.
*Camshaft single bolt- Chevy dealer did not have this bolt nor the auto stores. I found it at GM, it was thier last one and they said it is for a Pontiac.
*Oil pan bypass bolt.
*I got oil tower plugs (pound in), not necessary but for piece of mind.
*AFM/VVT delete the ECU. I sent mine through the mail to LT-1 Swap. Put it in the truck and it required no further programming.
*I had to modify my oil pressure sending unit filter as the valley cover is too shallow for the full depth of the filer. The filter is too long.
*Red Locktight.
*Blue Lockight.
Above are the things you will have to get to accomplish your rebuild.
Below, you may consider replacing while you have it taken apart.
*Water pump.
*Spark plugs.
*Belts.
*Oil filter.
*Valve springs (I did not replace my valves or valve springs).
I picked up a Dewalt electric ratchet at the beginning of my rebuild. Pretty sure it saved my life.
Flywheel tip; I picked up a flywheel holder. It is installed in place of your starter. This tool was worthless to me and Ive heard the same from others. I wrapped my harmonic balancer with a bicyle inner tube, looped a tie down around it and tightened it to the frame to remove the bolt.
I hope this helps. In the end my engine runs better than before the lifter failure.