I am looking at getting the 440 kit for my '02 400ex. However I never do anything with out research first. I talked to a machine gyro and he asked me a few different questions. I was wondering if anyone out there that has done this has the specs as to what the cylinder needs to be bored out to, to accept the new sleeve. second of all the machine guy asked me if the bore was perpendicular to the head mounting surface. If any one has an install spec sheet with dimensions as to what needs to be done to the cylinder it would help me out greatly Thanks in advance