I just wanted to know if there were any 9 Liter fans out there? I cannot really find any information on them period nor anybody who has heard of them, or has heard of them and likes them. I know the DTs might have been superior in power and reliability, but they just don't have that "big block V8 sound." I was rather interested on some of the technical aspects of the engine, like strong points, weaknesses, and history of the engine. I know there was a DV550, and perhaps something called a D190. I bought a complete service manual set off ebay, figuring the item would have my engine and the 6.9 in it, but those engines were left out. Even though this manual was covering the 87/88 model years. The number on the book was CTS-4245. What book would I need to get the right information on the engine/chassis? I have a 1987 International S-1800 school bus. Thanks for any help.