None, since there can be no conversion.
A gram is a measure of mass. A cubic inch is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid. If you are not convinced, consider a cubic inch of air. How many grams? Next consider a cubic inch of lead. How many grams?
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Undefined. Inches a measure of length, whereas cubic inches are a measure of volume.
The volume of 1 cubic foot cannot be converted to a length in inches. One cubic foot is the volume of a cube 12 inches wide, 12 inches high, and 12 inches long.