i was reading wizzerick's post on the "new" 261 that he got ahold of, congragulations by the way, and now im really curious about this rare engine. i was wondering what makes it so saught after? is it more similar to the 235 or the later 230 and 250's? also whats all this about a 848 head? what makes it so special? any other interesting facts you guys want to add in would be appreciated. thanks