Its worse when s 'pro' has built the engine. I had a 2.0 zetec off a guy here in leics for my old fiesta. Lasted 500 miles. Some of the valves were bent (cos he didnt do the tensioner up properly) upshot was i had a melted head and 4 knackered pistons. Bought all the bits myself and rebuilt it. Fired first time, still goes very, very well with the new owner!! My point is: It willl be sweet when its fixed.