Shelby Prototypes: The Cars That Never Made It to Production
What do a supercharged Mustang, a mid-engine Shelby Cobra, and a forest green tech mule have in common? They were all Carroll Shelby’s dreams that never reached production—but they’re legends just the same.
Carroll Shelby’s career was marked not only by his production icons like the Shelby Cobra and Shelby GT350 but also by several bold prototype vehicles that never made it to mass production. These one-off or few-off cars span from the 1960s through the early 2000s, showcasing cutting-edge engineering and wild design ideas. Below, we explore some of the most notable Shelby and Shelby American prototypes developed under Shelby’s direct involvement during his lifetime, detailing their origins, specs, unique features, and why each ultimately stayed a dream.
Shelby/De Tomaso P70 (1965)
How It Came to Be
In 1965, Carroll Shelby contracted Italian automaker Alejandro de Tomaso to create a Can-Am sports racer. Shelby provided a high-powered Ford 289 V8 tuned to around 475 horsepower and commissioned designer Peter Brock to pen an aluminum-bodied spyder. The resulting car, initially called the “De Tomaso Sport 5000” and later the P70, was an open-top, mid-engine racer built on a modified Vallelunga backbone chassis. Shelby envisioned building 50 units for competition, but only one prototype was completed.
Under the Hood and Beyond
The P70 was a true engineering showcase. It featured a lightweight chassis with fully independent suspension, cradling the mid-mounted 289 cubic-inch V8, which was mated to a 5-speed transaxle. Innovatively, it sported an adjustable rear airfoil for downforce—a highly advanced feature for its time—and full doors, which were an unusual touch for a spartan racer. Weighing in at a mere 1,450 pounds, the car boasted an exceptional power-to-weight ratio. The striking bodywork, refined by Fantuzzi after Shelby's initial feedback, was finished in a vibrant red and captivated audiences at the 1965 Turin Motor Show.
Why It Never Reached the Track
Shelby withdrew from the project by late 1965 to refocus on Ford’s GT40 Le Mans program, leaving de Tomaso without his key patron. Without Shelby’s backing and Ford connections, the project fizzled. De Tomaso repurposed the sole car as a Ghia De Tomaso show car, and it saw only a brief racing attempt before being mothballed.
Shelby “Lone Star” Cobra III (1968)
The Vision for a New Cobra
By the mid-1960s, Shelby American sought a successor to the famous Shelby Cobra roadster. Codenamed the Cobra III, this project resulted in a single prototype later dubbed the Lone Star. Development was a transatlantic effort. Shelby’s team outlined ideas for a front-engine roadster using Ford’s upcoming 351 V8, but their British partners at JWAE proposed a more radical approach. Shelby approved the design, and in 1968, a lone mid-engine Lone Star prototype was built in England and shipped to Shelby American in California.
Design and Performance Details
The Lone Star featured a 289 cubic-inch V8 mounted amidships, paired with a ZF 5-speed transaxle. The chassis was a hybrid of Cobra and GT40 components, riding on a 92.8-inch wheelbase. It used GT40-based suspension and Cobra-sourced brakes. Clothed in an aluminum body by Gomm Metalworks, it had a removable Targa roof and clamshell-style front and rear body sections. Finished in bright red, the Lone Star looked like a futuristic Cobra with GT40 DNA.
Where It Fell Short
After evaluation, Ford declined to greenlight the Lone Star for production. Concerns included the awkward ingress over wide fuel-filled sills, looming federal safety regulations, and a projected price of around $15,000. Without Ford’s financial backing, Shelby lost interest, and the Lone Star became a one-off.
1967 Shelby GT500 Super Snake
Goodyear’s Speed Demon
The Super Snake was an experimental one-off Shelby GT500 created in 1967 as a high-speed tire test car for Goodyear. Shelby American fitted it with a racing 427 Ford V8, the same type used in GT40 MkII Le Mans racers. Shelby personally piloted the car at Goodyear’s Texas test track for a few laps. Test drivers averaged 142 mph over 500 miles and topped out around 170 mph. The Super Snake met its goal and stirred interest in a production run.
Specs That Stole the Show
The car housed a blueprinted 427 cubic-inch V8 rated at 520 horsepower, backed by a heavy-duty transmission and drivetrain. Shelby added oversized brakes, a Detroit Locker rear differential, reinforced suspension, and Thunderbolt high-speed tires. It wore triple over-the-top racing stripes, a redesigned grille, and unique badging while retaining its GT500 fastback silhouette.
Why It Remained a One-Off
Despite its success, the Super Snake was deemed too expensive to mass-produce. It would have cost over double the price of a standard Shelby GT500, making it unaffordable for most buyers. Shelby scrapped plans for a production version, and only one was ever built.
1967 Shelby GT500 “Little Red”
An Experimental Coupe
Little Red was a special 1967 Shelby GT500 EXP prototype and of two Shelby GT500 hardtop coupes ever built. Ford supplied a Candy Apple Red notchback Mustang, and Shelby American outfitted it with a twin supercharged 428 V8. It served as a rolling testbed in 1967, helping develop components that influenced later models like the GT/CS and the 1968 Shelby lineup.
What Made It Different
Little Red’s configuration evolved over time. It began with a naturally aspirated 428 Police Interceptor V8, later upgraded to twin Paxton superchargers. It included upgraded suspension and brakes, Shelby body parts, and the formal roofline of a notchback Mustang. It also tested rear spoiler designs and side scoops.
Why It Disappeared
Only two notchback Shelby GT500s were ever made - the other being the 1968 “Green Hornet” prototype. Ford and Shelby decided to stick with fastback and convertible bodies. And the car was the only twin supercharged Shelby GT500 every built. The experimental features were too costly or not ready for production. Little Red was sent back to Ford and presumed destroyed until its rediscovery in 2018.
1968 Shelby EXP 500 “Green Hornet”
A Tech-Heavy Test Mule
In 1968, Shelby American created the Green Hornet, a Shelby EXP 500 prototype that started as a California Special coupe. It was heavily modified to test new technology like fuel injection, disc brakes, and independent suspension. Painted Dark Green, the car pushed the boundaries of what a Shelby Mustang could be.
Performance and Innovation
The Green Hornet had a 428 cubic-inch V8 with an experimental Conelec electronic fuel injection system. It also featured four-wheel disc brakes and independent rear suspension. The upgrades made it significantly more advanced than the production Shelby GT500s.
Why It Stayed in the Stable
Though effective, the innovations were too expensive for production. Fuel injection and IRS were deemed impractical, and the project ended with just the single prototype. Like Little Red, the Green Hornet survived and became a collector’s gem.
Shelby's Unbuilt Dreams: A Testament to Innovation
Throughout the decades of Carroll Shelby’s automotive reign, these prototypes underscore his restless innovation and willingness to push boundaries. From mid-engine experiments and supercharged muscle cars in the 1960s to high-tech one-offs that never saw the showroom floor, each prototype had a unique story. Ultimately, whether due to cost, timing, or corporate decisions, these vehicles never saw production. Yet they remain fascinating chapters in automotive history, offering a glimpse into Shelby’s unfulfilled ideas and what might have been.
Whether you're into legendary one-offs like Little Red or just love the roar of a classic Cobra, there's no better way to show your Shelby spirit than with some iconic gear.
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