The 455 cubic-inch Rocket V8 (W46) was rated at and 500 lb/ft of torque. This is the same engine as A/C equipped 68 Hurst Olds' and provided better drivability. The same engine was used for both A/C and non-A/C cars. The engine received a unique intake manifold, chrome steel valve covers, and a special vacuum operated air cleaner lid to allow cold air from the hood scoop into the carburetor. This was backed up by a specially calibrated code OH Turbo 400 transmission and 3.42 gears for non-A/C cars or 3.08 gears for cars with A/C. Optional 3.91 gears were available only for non-A/C cars.