The torque of the 20R power plant is produced due to its 2,189-cubic-centimeter size. The engine utilizes a single overhead cam design with a total of eight valves to produces its total torque.
The 1975 to 1978 models of the 20R engine produced a total of 122 ft.-lb. at just 2,400 rpm on the tachometer.
The 1979 and 1980 models of the 20R engine produced a peak of just 120 ft.-lb. of torque, arriving at 2,800 rpm on the tachometer.