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under stress cylinder walls change shape - oval
thats fine until you want to make a good lot more hp (block depending)
Say you want to add around big lbs of boost, or a large shot of n2o....or a totally mad sick jdm y0 n/a build...Well the stock sleeves of the engine probably (at all) cant handle that kind of power and under the immense amount of stress they crack.
So you just get larger, thicker, tougher sleeves put in.
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