454  of 454 CID (7.4 L) with a four-barrel carburetor, rated at 360 hp (269 kW) at 4800 rpm and 500 ft·lbf (678 N·m) of torque at 3500 rpm. It also included heavy-duty  suspension , wider tires, "SS 454" badging, and an automatic load-leveling rear suspension. The Turbo-Hydramatic transmission (with a 3.31 rear axle) was a mandatory option with