Featured in the initial offerings of both the Pinnacle and new Granite models is Mack's new MP7 engine. The MP7 is an 11-liter engine available in the three Mack engine families-Econodyne, Maxidyne and MaxiCruise-in six horsepower ratings between 325 and 405 hp., with torque ranging from 1260 to 1560 ft.-lb.