i think there is a write-up about running engines in, in the front of the burton power catalogue. Some good info in thier. I always thought 500 easy miles then slightly harder (no more than 3.5k) was the way. Did this with my mk1 escort when i rebuilt it, and that took a right beating. make sure you use cheap/crap oil like own brand stuff for the first run as the fully syns tend to clean the engine and you dont wanna do that initially.