Old Dog Looks New The restored 1984 Mack R Model, originally custom-built for Johnny Prescott and Son Oil of Concord, New Hampshire, represents both Mack's legacy and a personal journey for its ...

The Mack packs under its high-standing hood a Thermodyne six-cylinder diesel engine. It displaces 673ci and its undisclosed power levels are sent to the road in control bursts thanks to a five ...