The alternative approach was to increase the displacement of the existing inline 6 from 71 cubic inches to 110 cubic inches, which resulted in the 6-110 or 660 cubic inches total displacement.
The alternative approach was to redesign the engine to increase the displacement of the existing inline 6 from 71 cubic inches to 110 cubic inches, roughly a 50% increase. This resulted in the model 6-110 or 660 cubic inches total displacement.