One heavy-duty engine choice transformed a basic pickup into a platform that significantly reshaped diesel performance and aftermarket tuning culture.

Cummins has been building pickup truck engines since 1989, which is when it first offered its legendary 359 cubic-inch inline-six engine known as the 6BT, often considered one of the best American ...

The 5.9-liter Cummins is diesel royalty. It's the reason thousands of Ram trucks from the late '90s and early 2000s are still climbing hills, pulling trailers, and terrifying Priuses in the fast lane.

Cummins diesel engines are highly regarded as being tough and reliable. However, the 5.9L Cummins 24-valve engines produced from 1999 to 2002 used engine blocks that are prone to cracking. While any ...