Builders: Square engine, Over Square, or Under Square for you?

This is an unanswerable question due to the near endless amount of combinations. If you tested this idea at the same cubic inch then you would also have to try the various strokes. Then there is every part of the engine that has to match and then every part of the engine that can be replaced with another part to try.

So, having a many different cranks, rods, journal sizes, pin sizes, piston variations, camshafts, bearings, don’t forget the roller cam bearings, piston ring packs…….. every part changeable on the engine would need to be compared.


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.