[Woodz428]

Originally Posted by olddog

I haven't got it apart enough to measure the bores, but there are no ridge lines at the top. This engine has 105K miles on it. By feel I'm guessing less than 0.010 wear as I cannot feel anything anywhere, and you can still see the hone lines. Here is where it becomes relevant. This is an aluminum block with steel sleeves. I think the steel sleeves hold up much better than cast iron. This is a plus for a modern aluminum FE block, assuming they use steel sleeves rather than cast iron.

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.