- Engine
- 5.3L DOHC V8, four twin-choke Weber 42DCNF carburettors (fuel injection from Series 3)
- Power
- 280 bhp @ 5,000 rpm; 320 lb/ft torque (Series 1 also published as 320 hp, estimated)
- Transmission
- Chrysler Torqueflite three-speed automatic
- Chassis
- Long-wheelbase Aston Martin V8; Series 1 (1974) DBS-derived, wedge cars (Series 2 / 3 / 4) an entirely new William Towns body on the same underpinnings
- Body
- Series 1 conventional four-door saloon (William Towns, DBS-based); Series 2 / 3 / 4 wedge saloon (William Towns 'folded paper' design). Series 4 (1987) rounded edges, deleted pop-up headlights in favour of six smaller lights, deleted side swage line, 16-inch wheels.
- Instruments
- First production car in the world to use computer management and a digital instrument panel — LED (Series 2), CRT (Series 3). Development cost variously reported at three or four times that of the entire rest of the car.
- Performance
- 0–60 mph in 7.9 sec; ~145 mph (149 mph also published)
- Production
- 645 across 1974–1990 including the seven Series 1 cars, or 638 wedge cars alone. Published Series 4 figures give 105 or 98.
- Launch and rollout
- 1976 London Motor Show (Earls Court) sensation, but the prototype was a non-runner; production began 1978 with only 16 cars completed in the first two years.
- Period price
- £32,620 in 1977; ~£50,000 by 1980 — among the most expensive saloons in the world in period, approached only by the Rolls-Royce Silver Spirit / Spur and Bentley Mulsanne.
- Period reception
- Later included on Bloomberg Businessweek's '50 ugliest cars' and Time's '50 worst cars' lists