The first-gen Cummins engines cost a pretty penny today, and it's because these 5.9-liter diesels were fantastic, along with being so influential to the industry. Just how much torque does a 5.9 ...

the popular heavy-duty truck offered the Cummins third generation of engines, the 5.9-liter inline-six-cylinder diesel. Another change was a switch to 24-valves over the previous 12-valve setup ...