Introduction

Western Star debuts its EPA 2007 chassis by featuring a 4900 EX with a Detroit Diesel Series 60 engine and 82-inch Stratosphere™ sleeper. The chassis' design changes - including updated cooling packages and new exhaust systems - will be made to all Western Star truck models to meet the new emissions requirements that take effect January 1, 2007. Western Star has developed a new option to increase the ease of engine accessibility for heavy-duty applications. The 4900 SA with 123-inch BBC is now available with a butterfly hood, which was developed with hinged, removable side panels that fold up like butterfly wings for easy engine access without having to tilt the hood forward.

As a result of the changes in standards, Western Star's radiator packages have increased in size. In order to accommodate the larger radiators, Western Star added a drop front frame casting for the axle configurations on all models to allow for increased cooling capacity without having to make exterior modifications to the traditional Western Star hood and grille. Raised radiator configurations with integral front frame extensions and a front engine power takeoff are also available for vocational applications.