not sure what direction your heading but if you don't want to spend tons of money and if these parts will work in a 5.3L, I have some used lifters, rocker arms, push rods, camshaft, oil pan, I think I still have the oil pick up tube that goes in the pan(not sure if either will work in the 5.3L), a few valves and valve springs out of a 6.0L LQ9 block that had less then 1,500 miles on it, I bought a long block for my camaro and didn't use any of that stuff, I had a set of LS6 valve springs and retainers but those are spoken for, I just wanted the block