The motorcycle boys have been using cracked rods in their production bikes for some time now I believe. I really wish sometimes that our automotive engineers would pay attention to the guys putting together these bike motors, those guys don't mess around.
I do know that when Ford really wanted to hop up the Taurus without just adding cubic inches that they went to Yamaha. Not that the Ford guys couldn't do it but when it comes to making big power out of little motors the bike guys do some amazing things.
Have a good one,
Dan