The 1st-gen Cummins, a truck available from the late 1980s through to 1993, was more traditional in style than the 2nd-gen ...

In midyear 1998, 2nd-Gen Cummins trucks received an engine upgrade that featured the 5.9-liter engine block, highlighted by a bigger, better-flowing 24-valve cylinder head.

The radiators in the bed are another hint that the second-gen 1990s pickup truck was modified with drag racing in mind. But it's the front hood that hides the truck's main highlight, a big Cummins ...

With emissions standards for over-the-road truck engines becoming more stringent every year, ... Heavy-Duty Truck Engine, The Cummins X15. ... Eliminating as much drag as possible frees up power.