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Originally Posted by Woodz428
I think you are coming to a conslusion that is waaay off. Since the introduction of low tension piston rings in mass production in the 80s(created as a way to elevate CAFE) cylinder wear is much less than it once was. I have pulled down several 5.0 roller motors with over 120K and they have minimal wear also. I think the reduction in wear you are seeing is a result of the ring design and has nothing at all to do with the block metallurgy.
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I'm sure the rings would make a differance, but back in the day (60's & 70'S) I have pulled engines with 100K miles apart that had 0.030" taper worn into the cylinders. Generally the bottoms of the bores would be way out of round from the thrust of the piston skirts. I suspect rings alone do not explain it all. In fact the 4.6 modular pistons have the skirts coated to reduce piston wear. I would assume this would make the piston harder, which should cause even more wear to the bore. However your 5.0 observation is an interesting data point.