I bet any money if they changed the rules to allow bigger pro-stock motors they would run them tommorow even if it meant lower RPM.

A 4 inch stroke is only a limit to RPM and NOT power or ultimately speed! Run the biggest cubes you can afford, that being said BPE makes it easy and affordable to run a 4.25 crank if you have 340 mains and 4.125 if you have 360 mains.

I am not causing global warming, I am just trying to hold off a impending Ice Age!