The 1968 Shelby GT500KR Convertible is a muscle car icon that embodies power, exclusivity, and timeless design. As part of Carroll Shelby’s legendary Mustang lineup, the GT500KR (King of the Road) represented the peak of Mustang performance in 1968. With its aggressive styling, potent Cobra Jet engine, and limited production numbers, this convertible remains one of the most sought-after classic muscle cars of all time.
The Birth of a Legend: Why “King of the Road”
By 1968, the muscle car wars were in full swing, and Ford needed a Mustang that could dominate the competition. Shelby answered the call with the GT500KR, an upgraded version of the already powerful GT500. The “KR” stood for “King of the Road,” a name chosen to emphasize its superiority over other high-performance cars of the era.
Key Highlights of the GT500KR Convertible:
- Limited Production: Only 318 convertibles were produced, making it an extremely rare collector’s item.
- Cobra Jet 428 V8 Engine: Advertised at 335 horsepower but unofficially capable of over 400 HP.
- Aggressive Styling: Unique Shelby badging, scooped fiberglass hood, and an aerodynamic fastback-inspired stance.
- Convertible Rarity: While most muscle cars focused on coupe models, the GT500KR Convertible offered open-air performance like no other.
Heart of the Beast: The Powerful Cobra Jet 428 Engine
At the core of the 1968 Shelby GT500KR was the 428 Cobra Jet V8, an engine designed for domination. Originally underrated at 335 horsepower, real-world tests proved it delivered well over 400 HP and 440 lb-ft of torque. Paired with either a four-speed manual transmission or Ford’s Select-Shift automatic, the GT500KR was a force to be reckoned with.
Performance Specs:
- Engine: 428 Cobra Jet V8
- Horsepower: 335 HP (underrated; actual output exceeded 400 HP)
- Torque: 440 lb-ft
- 0-60 MPH: Around 6.5 seconds
- Quarter-Mile Time: Mid 13-second range
With these specs, the GT500KR Convertible was one of the fastest muscle cars of its era, outpacing many of its rivals in both speed and acceleration.
A Design That Commands Attention
The 1968 Shelby GT500KR Convertible was built to turn heads. It featured bold styling cues that made it instantly recognizable on the streets and racetracks alike.
Signature Shelby Styling Features:
- Dual Racing Stripes: Classic Shelby GT500 design touch.
- Fiberglass Hood with Functional Scoops: Enhancing airflow and engine cooling.
- Shelby Badging & Cobra Emblems: Exclusive to the Shelby lineup.
- Side Scoops and Rear Deck Spoiler: Adding to the aggressive aesthetic.
- GT500KR-Specific Interior Trim: Sporty bucket seats, woodgrain dash, and Cobra badging.
The convertible top option provided the thrill of open-air driving, further enhancing the GT500KR’s exclusivity and desirability.
The Driving Experience: A Muscle Car with Attitude
Owning and driving a 1968 Shelby GT500KR Convertible was a statement. This wasn’t just another Mustang—it was the King of the Road. The Cobra Jet engine’s raw power, combined with Shelby’s performance enhancements, made for an exhilarating ride. The heavy-duty suspension and upgraded brakes allowed for better handling, though the car still had the untamed muscle car spirit that demanded respect from its driver.
Rarity and Collectibility: A True Investment
With only 318 GT500KR Convertibles ever built, this classic has become a highly sought-after collector’s car. Today, pristine examples of this vehicle fetch well into the six-figure range, with some exceeding $250,000 to $300,000 at auction, depending on originality and condition.
Factors That Influence Value:
- Matching-Numbers Engine and Transmission
- Factory-Original Paint and Interior
- Low Mileage and Documented Ownership History
- Presence of Shelby-Specific Components and Badging
Conclusion
The 1968 Shelby GT500KR Convertible remains one of the most legendary muscle cars ever built. Its combination of brute force, stunning design, and extreme rarity solidifies its place in automotive history. As a true embodiment of the golden era of American muscle cars, the GT500KR Convertible continues to captivate enthusiasts, collectors, and speed lovers alike. Whether parked at a car show or tearing down an open highway, the King of the Road reigns supreme.
