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it's because the forces in a boxer are operating in opposition to each other; where as the inline 4 runs forward and back 1-4,2-3(flats go 1-2-3-4); along with it being a 360 crank change instead of 180 of the flat 4.
maybe the older engines inline 4's have a 90 degree offset instead of 360. along with thicker material and bigger crank/rod bearings lands. the 70's brought in the minimum is enough thought pattern
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