What would it take to make 1.44 lbs-ft per cid ?

Anyone hear of this formula for tuning (sizing ave. csa of intake and header) for peak torque rpm?
Supposedly base on that an engine torque peaks at 240 fps. (obviously there's other factors that influence where it peaks).

csa = cid of one cylinder x rpm / 88,200

https://www.motortrend.com/how-to/ctrp-1101-intake-exhaust-size/