most of it is to try to get seals and everything to fit in, which just means not to run the car @ certain rpm for a long period of time, just rev up and down, that will wear the rings in and seal propertly, and probably most other things inside an engine.
1993 nissan 240sx hatchback(stock) <<drifter, straight liner, road courser
"Horsepower is the force that determines how fast you hit the wall. Torque is the force that determines how far you take the wall with you after you hit it."
"Horsepower sells cars, torque wins races" - Carroll Shelby
"Real cars don't make power at the front wheels....they lift them."