Flatbedford said:There is a guy in the Northwest (forgot which state now) who installs Cummins 4BT 4 cylinder turbo diesels in all kinds of light trucks. His 1970 4x4 F250 gets around 30 mpg with this conversion. My 1970 F350 gets about 8 mpg with the factory V8. The diesel also puts out more torque and hp. There are better ways to do things.
There's a local guy here that will put a Cummins (4BT or 12V 5.9) in about anything you want. My buddy just had a 5.9 transplanted into a F350 when the 7.3 gave up the ghost. I know a guy that has one of those Japanese mini-trucks and swapped out the stock engine with a 3 cyl Kubota...not sure if it even gets 60 MPG.