Background
Why can’t we cruise legally at more than 70mph on a UK motorway? Because of the AC Cobra. Back in 1964, when you could go as fast as you liked on the new M1, AC cars tested a Le Mans Cobra at 185mph on the five year old tarmac, which was the beginning of the end of autobahn-style high speed cruising in Britain. A 70mph speed limit was introduced the following year.
The Cobra was an unlikely fusion of a lithe and sophisticated English sports car with a crude, brutish but highly effective American V8 engine. Powered by a 2-litre 128bhp straight six Bristol engine the AC Ace was an instant hit and began to dominate racing circuits in Europe and America. It even took class honours at Le Mans in 1958. But in 1961 Bristol stopped producing the 2-litre engine, leaving the Ace’s future up in the air.
Carroll Shelby was itching to build a two seater sports car, but struggled to find a chassis and a manufacturer that would support his efforts. Now with a medical condition that effectively sidelined his racing career, Shelby wanted to continue his involvement in racing not as a racer, but as a team owner and constructor.
Having seen the Ace dominate SCCA events in America, Shelby caught wind of the Ace’s potential demise and contacted AC with a proposal. He wanted AC to send a car to Los Angeles to see whether he could shoehorn a Ford V8 into it.
AC shipped him a car and within a few months Shelby was sitting in an Ace with no engine and no suspension. He then talked Ford into sending a few engineers to his shop as long as he committed to install a Ford engine into all of his cars.
Shelby assured Ford management that his car would dominate the racing world and create a name for Ford in a period that was dominated by Porsche and Ferrari. By 1962 he’d stuffed a small block Ford V8 into the Ace, and renamed it the AC Cobra. Thus, a legend was born. Then in 1964 he decided to take the already wild Cobra into truly outrageous territory.
Shoehorning the 289 into the engine bay of the Cobra was no small feat, but fitting a 427ci (7-litre) big block V8 into an engine bay designed for a 2-litre straight six was impossible. Again, calling on the masters at Ford, Shelby took to rebuilding nearly every single component of the AC Cobra to fit this massive powerplant.
He stretched the body in nearly every direction, relocated the transmission tunnel and moved suspension pick up points. Only the windscreen and boot lid are interchangeable between the 289 and 427 Cobras, and the final result was staggering. Power was officially 475bhp, although Shelby himself, says it was more like 550bhp, with over 500lb-ft of torque. Enough to get to 60mph in 4.6 seconds. That’s high performance in 2021 – in 1964 it was staggering.
On road and track the AC Cobra simply embarrassed everything that came across its path in everything from straight-line speed to brutal acceleration. Production ended in 1968 when AC finally halted production of the body, a very short production run for such an iconic car.
And only 998 Cobras were produced from 1962 – 1968, with just 348 of them being 427s. Of those, only 260 were road cars while the rest were designated as competition models. Today there are fewer than 100 actual, real Cobras out there. When they go up for sale, they fetch eye-watering sums.
It’s because of the scarcity of original AC Cobras that specialist companies started building replicas of these fantastic beasts. However, not all replicas are created equal. What we have here is arguably the best of them all.







