Description
The 400-horsepower version of the Corvette Sting Ray was introduced in 1966 as the L68 option—a 427-cubic-inch big-block V8 breathing through twin four-barrel carburetors. Unlike the base 390-hp L36 and the higher-output 435-hp L71 “Tri-Power” model, the L68 struck a balance by delivering robust torque and broad power delivery without the complexity of three carburetors. With a compression ratio of 10.25:1 and a hydraulic-lifter camshaft, it produced its peak output at 5,200 rpm, making it one of the most potent two-carburetor street engines of its time.
Visually, Corvettes equipped with the 400-hp engine were largely indistinguishable from their lower-powered siblings, though buyers could specify a cowl-induction hood to hint at the performance beneath. Both coupe and convertible retained the sleek fastback styling that Chevrolet had refined since 1964, with the coupe’s single-piece rear window replacing the earlier split design. Subtle “427” emblems in the side coves and unique air cleaner decals offered the keen observer a clue to the car’s heart.
Chassis upgrades on the L68 included heavy-duty front and rear springs, larger stabilizer bars, and a choice of close-ratio four-speed manual or three-speed automatic transmissions. Independent double-wishbone front suspension and a transverse leaf-spring rear setup provided handling that belied the Corvette’s generous wheelbase, and front disc brakes came standard to help rein in the added power. Optional power steering and power brakes could be ordered for drivers seeking more relaxed control, especially in the convertible.
Inside, the cockpit was a blend of race-inspired functionality and growing creature comforts. Deeply bolstered bucket seats held occupants firmly in place during spirited driving, while the twin-cowl dashboard placed large, clear gauges directly before the driver. Options such as air conditioning, a tilt steering column, and an AM/FM radio allowed for long-distance touring without sacrificing the car’s sporting character. A removable hardtop remained available for coupe buyers seeking additional insulation and security.
On the road, the 400-hp Sting Ray was capable of dispatching the 0–60 mph sprint in the mid-five-second range—impressive figures in an era when many “muscle cars” struggled to match such performance. The dual-quad induction gave a crisp throttle response, and the broad torque curve meant that drivers rarely needed to downshift more than one gear when accelerating out of a corner. This made the L68-equipped Corvette both a formidable straight-line performer and an engaging drive on winding roads.
Today, the 1966 Corvette Sting Ray 400-hp occupies a special niche among collectors. Produced in limited numbers compared to the base and tri-power models, it represents a pure expression of big-block performance without the expense and tuning challenges of fuel injection or triple carburetion. As a result, well-preserved examples continue to draw strong interest at auctions, celebrated for their balance of historic significance, performance capability, and the timeless appeal of America’s pioneering sports car.