All fair but I am talking specifically about that single change from a theoretical standpoint. Obviously there would be different parts involved with a bigger piston etc, but on paper, what would that 1.3 sq/in add.
If you look at torque differences between 273/318/340 350/361/383/400 383/413/426/440 displacement was done through Bore size, kind of show what's being added.
But it you look at the 4" bores displacements 289,302,351w,m,c and 400 or 302,327 and 350 or even our 360 torque difference is mainly stroke, or engines of similar displacements but vastly different bore stroke ratios for a certain performance (efficiency level) torque to cid is also generally similar.