Sunbeam Tiger Roadster V8 1964 to 1967

When Ferrari passed on refurbishing the underpowered Sunbeam Alpine’s engine, Rootes Motors turned to Carroll Shelby, fresh off building the AC Cobra. What followed was a secretly funded Ford V8 swap, a surprised company owner, and an order so large it was the biggest Ford had ever received from another automaker. Read on to find out how the Sunbeam Tiger came together in eight months.

Ferrari turned down the job. That should have been the end of it. Instead, a struggling British roadster with a name borrowed from a 1925 land-speed-record car ended up with a Ford V8 shoehorned under its hood, thanks to a designer who had just finished doing the same thing to the AC Cobra. What happened next involved a company owner who didn’t even know the project existed until it was already road-testing in Los Angeles, and an order so large it became the biggest single purchase Ford had ever received from another manufacturer. The Sunbeam Tiger’s origin story reads like a fluke that somehow worked out for everyone involved.

An Underpowered Roadster in Need of Help

The Sunbeam Alpine had been in production since 1959, but by the early 1960s it was clearly underpowered for the sports car market it was trying to compete in against faster, more modern rivals. Rootes Motors first approached Ferrari about refurbishing the Alpine’s four-cylinder engine to boost its performance figures, but that conversation never produced a workable outcome, leaving the company searching for another solution entirely from scratch.

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Carroll Shelby’s Second Act

Rootes turned next to Carroll Shelby, fresh off a similar success shoehorning a Ford V8 into the British AC roadster to create the now-legendary Cobra. Shelby found that the Ford 260 V8 was light enough to fit into the Alpine’s engine bay with relative ease, a discovery that made the entire project plausible in the first place rather than just an interesting thought experiment.

A Secret $10,000 Budget

He secured a $10,000 budget for an eight-week redesign period from Rootes manufacturing manager Brian Rootes, all without company owner Lord Rootes knowing the project even existed at that stage. That kind of under-the-radar approval was unusual for a project of this scale, but it kept the work moving quickly without getting bogged down in corporate committee review before there was anything concrete to show anyone.

A V8 That Barely Added Any Length

The Ford engine measured less than four inches longer than the Alpine’s original four-cylinder unit, despite delivering roughly double the power output. That size advantage made the swap plausible in the first place, though the added weight, about 20 percent over the standard Alpine’s curb weight, still forced suspension changes, a switch to rack-and-pinion steering to free up engine bay room, and modifications to the car’s frame itself.

Testing in Secret in Los Angeles

By the end of April 1963, the prototype, nicknamed the white car, was undergoing road tests and trial runs around the Los Angeles area, performing noticeably better than anyone on the project had originally expected going in. Equipped with a four-speed manual transmission, the Tiger delivered performance genuinely comparable to the Jaguar XKE, but at a significantly lower price point for the average consumer.

Lord Rootes Finds Out

Lord Rootes eventually learned about the project his own manufacturing manager had authorized entirely without his knowledge or sign-off, and he was understandably miffed about being kept in the dark on something this significant. Rather than kill the project outright once he found out, he insisted on testing the white car prototype himself once it was shipped back to the UK for evaluation.

A Change of Heart

He came away genuinely impressed enough to move the project forward immediately, a reversal that surprised the engineers who had spent months worried their unauthorized work might get scrapped entirely. Once convinced of the car’s potential, Lord Rootes contacted Henry Ford II directly rather than going through normal supplier channels, a move that reflected just how urgently he now wanted this car built.

The Largest Order Ford Had Ever Received

That direct approach resulted in an order for 3,000 engine and transmission combinations, the single largest order Ford’s company had ever received from an outside manufacturer up to that point in its history. Normal development timelines from that stage would typically run three to four years before a car reached showrooms, but Rootes planned to unveil the finished Tiger at the 1964 New York Motor Show, just eight months away.

Built by Jensen, Powered by Ford

Jensen Manufacturing, which had done previous contract work for Rootes on other projects, took on production of the Tiger, reaching full production status by June 1964, remarkably close to that original eight-month target. Ford supplied the V8 engines, while Borg-Warner provided a fully synchromesh four-speed manual transmission for the earliest production units built.

A Borg-Warner Stopgap

That Borg-Warner transmission was a stopgap solution until Ford could supply enough Mustang four-speed transmissions to meet growing demand for the new Tiger across both markets. Fitting a V8 into a car never originally designed for one required some genuinely unusual production methods along the way, including workers taking a sledgehammer to the primed and painted firewall just to slide the engine into its final position.

300 Units a Month

Despite that improvisation on the assembly line, Rootes had the production line turning out 300 units a month within just three months of launch, with most of those cars destined specifically for American buyers rather than the domestic UK market. Shelby never got to manufacture the Tiger himself, since all production happened in the UK rather than his own facilities.

Shelby’s Royalty and a Legacy Secured

He did, however, receive an undisclosed royalty on every single unit sold, a quiet payday for a project he’d originally taken on as a favor rather than a full manufacturing contract. Between 1964 and 1967, the Tiger carved out its own lasting place in performance car history as proof that British handling and American V8 power could be combined into something genuinely competitive with far more expensive rivals.

A Plan That Never Went According to Plan

What makes the Tiger’s story worth revisiting today is how little of it went according to any formal plan. A rejected proposal from Ferrari, an unauthorized budget, a company owner kept in the dark, and an eight-month sprint to a motor show deadline all somehow produced a genuinely respected performance car rather than a cautionary tale about corporate dysfunction.

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