The Hemi Magnum V-8 engine, made famous for its use in Chrysler's 1960's "muscle cars," is returning. The new edition of the 5.7-liter engine will be installed in the 2003 Dodge Ram 2500 and 3500 pickups, according to Chrysler. The company also claims the engine is the most powerful in its class, with 345 hp, but also has the highest torque at 395 pound-feet.