AC Cobra 427: The Wildest Roadster of the 1960s

There are fast cars and there are frightening cars. The Cobra 427 belongs to the second group. A small, light British roadster with a huge 7-litre American V8, no electronics, no ABS, nothing to save you if you press the throttle too hard. Sixty years later it is still one of the most spectacular cars ever built, and certainly the most copied.

From the 289 to the 427

The story began in 1962, when Carroll Shelby put a Ford V8 into the British AC Ace. The first Cobras had 260 and 289 cubic-inch engines, 4.3 and 4.7 litres. They were extremely fast and won many races. On the big circuits, however, such as Le Mans and Sebring, the powerful Ferraris and big-engined Chevrolet Corvettes began to catch them.

Shelby’s answer was simple: an even bigger engine. He chose Ford’s 427, a 7-litre V8 born for NASCAR racing. The problem was that the old AC chassis could not handle that much power.

A completely new car

So an almost entirely new car was designed for the 427. The chassis had wider, thicker tubes, and the suspension gained coil springs on all four wheels instead of the old leaf springs. Ford engineers helped design it with the help of a computer, something very rare at the time. The body, always built by AC in England, became wider, with flared wings for the big tyres and a larger mouth for the radiator.

The homologation that never came

Shelby wanted to race the 427 in the GT class of the 1965 world championship. To be approved by the FIA, however, 100 race cars had to have been built. When the inspectors arrived, only about 50 were finished. Homologation was refused.

Shelby was left with racing Cobras that could not race. So he turned them into road cars, with bumpers and a slightly quieter exhaust, and sold them as the 427 S/C, “Semi-Competition”. Today those few S/Cs are among the most valuable Cobras in the world.

How fast?

With around 425 horsepower and a weight of about 1,100 kilos, the Cobra 427 went from 0 to 100 km/h in roughly four seconds. That was unbelievable in 1965 and respectable even today. Some road cars had the slightly milder 428 engine, but for the driver the difference was small. The Cobra was always a car that demanded respect.

The most copied car in the world

Production stopped in 1967. Fewer than 350 Cobra 427s of all types had been built. A few years later the first replicas began to appear, and today tens of thousands have been made around the world, from kits for amateurs to extremely accurate copies. Very few cars have such a recognisable shape.

If you ever see a Cobra at a show, the odds are it is a replica. But if it is genuine, look at it carefully. You are looking at one of the most important cars in American history.

P.Kefalas