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fordracer,
Core shift refers to the casting process of the block. It has nothing to do with miles, heat cycles, etc. It is there from day one.
The point is, engine blocks are made with a process called "sand casting". To produce the water passages and other details of the block, "cores" are used. These cores can move during the pouring operation and move things like water passages, block reinforcement areas, etc.
I recommend that you do a search on sand casting (Google) and read up on the process. This will be much better than me trying to tell you how it works.
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