Those engines are just what im looking for. Im not to concerned with a little extra weight i can lighten other parts of the car to make up for it. I need to measure how much space i have under the hood to work with and i need to figure out how much my stock engine weighs so i'll be able to guess at a final weight so i can figure how much power i'll really need. I know where an onan 4 cylinder is that i could probly get very cheep but onans are heavy and underpowered, do you have any experience with onan diesels? Can more power be made with one safely? I'd hate to hot rod it and start shedding parts on the test drive