• It is a measure of the displacement of the engine, specifically, the amount of fuel/air mixture drawn in after each cylinder completes one entire operating cycle. Engine displacement is equal to (bore) x (bore) x (stroke) x (number of pistons) x (.785).
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      Also, to convert litres to cubic inches, multiply by 61. The "409" of Beach Boys fame would be 6.7L, quite large these days.

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