I do have one question - If you're going to all the trouble to do an engine swap, why would you consider the 5.3 instead of the 6.0 when the engines are the exact same external dimensions, the electronics are the same, etc. For the money you spend it will SPANK your other options. Just my opinion.....
I wanted to compare the two... 5.3 is so much more closer to 5.4 than 6.0...
Besides, if I did a comparison of 5.4 vs 6.0... Surely the performance of the 6.0 will be better.
But I'm not just looking into performance.. I'm also looking into maintenance... I'm looking for issues with the engines that people have had with them.
I understand that there are quite a number of issues people have had with both engines.... But most issues seem to isolate themselves to their particular units, rather than the engine design.
I'm looking for the ones that hold on as actual design flaws... And I bet that even though there are fans of either engine, they will admit to something being a flaw in the engine's design.