10 Diesel Engines Packing the Most Horsepower You’ll Actually Care About

4. Mack E7 — The Old-School American Workhorse

This inline-six diesel has been trucking since 1989, with versions hitting up to 454 HP and a staggering 1,660 lb-ft torque. Mostly used in heavy equipment and semi-trucks, the Mack E7 is a legendary engine that’s stood the test of time.