I am always interested in a spare 6.5 engine. Hopefully you are not too far away. As far as value goes, my opinion is that unless it is a really good engine they are not worth very much because of the cost of rebuilding. One of my machinist friends, who rebuilds engines, told me it would cost "all of the money" to rebuild one. He personally likes the 6.5 and his only hang up is that they cost a lot to rebuild if done right. I paid 600 for a running parts truck and I feel that it was a good deal considering the mileage.