D12
The D12 replaced the Model CA in 1959. 4,070 D12's were made in their 10-year run from 1959 to 1968. The D12 had a 138.7-cubic-inch, four-cylinder, 31-horsepower gasoline engine that was tested in Nebraska at 29.43 drawbar horsepower.
Read more about this topic: Allis-Chalmers D Series