I have a 1984 n6 that turned around 2450. It turned loose this summer with a lot of blow by and some water in the oil. I bought another 670i out of a burned (cab fire) n5. I am in the process of changing in this week. I was told it had 500 hours on the motor???????? I know it was rated a 190hp were the n6 was to be 220. I thought I might change the pump from mine to the n5 motor. My machine only has 1800 hours and is rwa and very clean. I have also been looking at a 1991 r60. Don't know what to do. We also have a 1997 9600. It was down more than the n6 until the last three days when the motor turned loose. I am new here but have grown up around and loved the gleaners all my life. I run three Deere tractors 4450 8770 and 8870. Here is the old girl http://www.youtube.com/watch?v=bwO8l-6lfIU