Thats completly the opposite to what ive read. If you remember taggy, there was a guy that reccomended you afew books about building engines? Anyway i brought one of the books and ive been reading it, Its quite good and goes into depth about pretty much everything! In said book it gives you advice on running in.. It says you shouldnt let the engine idle on first start up, keep the revs at about 2-2.5k so that the camshafts and lifters are splash lubricated . Take the car on 10 min runs letting the engine become under load but try and avoid going over 3.5k. It also says take the car onto a highway or motorway to get in into top gear. Vary the engine speeds between 2k-3k, holding the engine rpm at a steady 2k, and accelerating the engine upto 3k using up to 3/4 throttle. As soon as 3k is reached let the engine slow back down to 2k. Using this running in method the engine is subject to acceleration load (piston rings under pressure) without excessive rpm being used, do thid over and over. This does serve to bed the rings in quite reasonably quickly without the possibility of overheating the internal engine components. After 10 mins running like this let the engine cool down completely. I brought the 4 cylinder engine short block high performance manual. <----- Good book!