The question, as stated, cannot be answered sensibly. A cubic inch is a measure of volume, with dimensions [L3]. A linear foot is a measure of distance, with dimensions [L]. The two measure different things and elementary dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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A linear foot is a unit of length. A cubic inch is a unit of volume. The two units are therefore incompatible.
2.5 cubic feet = 4,320 cubic inches
You don't. Square ft are a measure of area, whereas "linear" inches are a measure of distance. Likewise you can't convert cubic feet into inches, or apples into oranges.
54,600 cubic inches = 31.6 cubic feet
16 cubic feet = 27,648 cubic inches