Dodge and Ram trucks have used some impressive diesel engines over the years. Here are some of the best and how they've ...

But among Cummins' 1990s offerings, the 12V designation is pretty important, as it refers to the sort of 12-valve engines ...

The 12-valve 5.9-liter Cummins I-6 engine was developed ... This was also when first versions of the 24-valve, 5.9-liter engines were introduced. The new four-valves-per-cylinder design improved ...

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 ...