I don't understand why started with different Scr. If you where to build each engine to a certain level (cam) each engine would have similar CR example 10:1 or 10.5:1.
The Scr changes cuz I kept it simple, using the same 87cc total chamber size for each. But with each increase in stroke the swept volume increases.
The swept volume for these strokes are;695.3,752.03,796.15, and 840.26cc
I used the 87cc as a baseline, cuz it is easy to achieve, and it was what it mathed out to on the smallest stroke, nothing magical about the number.
I'll edit the swepts in.