| Engine & Transmission | Comet | Plymouth Valiant |
| Type | In-Line 6 | Slant 6 |
| Location | Front | Front |
| Displacment (cu. in.) | 144.3 | 170 |
| Horsepower | 85 | 101 |
| Torque (lbs ft) | 134 | 155 |
| Bore and Stroke | 3.50" x 2.50" | 3.4" x 3.125" |
| Compression Ratio | 8.7:1 Regular | 8.2:1 Regular |
| Carburetion | 1-bbl | 1-bbl |
| Cooling System | Water | Water |
| Full-Length Water Jackets | Yes | No |
| Spark Plug Size | 14mm | 14mm |
| Automatic Choke | Std | Std |
| Full-Flow Oil Filter | Std | Std |
| Transmission Control | Lever | Stick |
| Location of Control | Steering Column | Floor |
| "Park" Position on Automatic Transmission | Yes | Yes |
| | | |
| Chassis | Comet | Plymouth Valiant |
| Construction | Unitized | Unitized |
| Suspension-Front | Coil | Torsion Bar |
| Suspension- Rear | Leaf | Leaf |
| Turning Diameter (curb-to-curb) | 39'11" | 37'10" |
| Brake Lining Effective Area (sq in) | 114.3 | 129.1 |
| Axle Ratio (standard) | 3.50:1 | 3.55:1 |
| | | |
| Body | Comet | Plymouth Valiant |
| Exclusive Body Shell | Yes | No |
| Zinc-Galvanized Underbody | Yes | No |
| Finish (Type) | Super Enamel | Super Enamel |
| Full-Depth, Wrap-Around Front Bumper | Yes | No |
| Full-Depth, Wrap-Around Rear Bumper | Yes | No |
| Center Fual Filler | Yes | No |
| | | |
| Exterior Dimensions | Comet | Plymouth Valiant |
| Wheelbase | 114.0" | 106.5" |
| Over-all Length | 194.8" | 183.7" |
| Over-all Height | 54.5" | 53.3" |
| Over-all Width | 70.4" | 70.4" |
| Tread-front | 55.0" | 56.0" |
| Tread-rear | 54.5" | 55.5" |
| Tire Size | 6.00" x 13" | 6.50" x 13" |
| Windshield Glass Area (sq in) | 1232.0 | 985.0 |
| Total Glass Area (sq in) | 3439.1 | 3338.0 |
| Shipping Weight (lbs) | 2411 | 2595 |
| | | |
| Exterior Features | Comet | Plymouth Valiant |
| Bright-Metal Body Side Moldings (full-length) | Std | NA |
| Bright-Metal Backlight Reveal Molding | Std | Std |
| Bright-Metal Windshield Reveal Molding | Std | Std |
| Bright Roof Drip Molding | Std | NA |
| Gunsight Fender Ornaments | Std | NA |
| Variable Speed Tandem Windshield Wipers | Std | EC |
| Dual Horns | Std | EC |
| Dual Headlights | Std | Std |
| | | |
| Interior Dimensions | Comet | Plymouth Valiant |
| Head Room - front | 38.9" | 37.9" |
| Head Room - rear | 37.6" | 37.4" |
| Leg Room - front | 44.6" | 43.3" |
| Leg Room - read | 40.1" | 39.4" |
| Shoulder Room - front | 55.3" | 54.0" |
| Shoulder Room - rear | 55.1" | 54.1" |
| Hip Room - front | 57.0" | 56.8" |
| Hip Room - rear | 57.0" | 56.9" |
| Seat Room - front | 11.4" | 11.2" |
| Seat Room - rear | 14.2" | 13.7" |
| Trunk Volume (cu ft) | 28.5 | 24.9 |
| | | |
| Interior Features | Comet | Plymouth Valiant |
| Dual Sun Visors | Std | EC |
| Dual Front Arm Rests | Std | EC |
| Vinyl Headlining | Std | NA |
| Foam Front Set Pads | Std | Std |
| Bright-Metal Instrument Cluster and Controls | Std | Std |
