oops, I forgot to mention, there is a formula used to convert Cubic inches to Liters. I will look in my stuff for it and if I can find it I will post it. I think they do about the same thing with it except they round up to the nearest 1/10 of a liter. This formula should answer your question as to why they can have different displacements but still be the same liter. Even though they are different displacements look at how much they very, only a couple cubic inches, there is such little difference between them that they work out to the same amount of liters when using the formula.
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