It depends on the rings and who's shop it came from. I have an engine dyno and a chassis dyno, the engine dyno is the best place to break it in. Once an engine is out of my shop, its ready to go, grip it and rip it. But really the first 100 miles is very crucial to the motors life. Lots of people think that you should break it in the way you want to ride. This is not true. If you break in a motor correctly and dyno it, it will make more hp then the guy who rode it like he stold it.