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7 This block is part of a standard rebuild, so there’s no damage to the cylinder bores beyond normal wear. But notice the change in color around 2/3 of the way down the cylinder bores. This is the farthest the rings travel down the cylinder bore at piston BDC. Typically, you will see greater wear at the top of the cylinder bore because the strong pressure from the combustion charge pushes the rings out the hardest.