1966 Buick Skylark Gran Sport

©2007 Publications International, Ltd. Sloping sail panels coming off the rear of the roof were part of the 1966 Buick Skylark's redesign, but the new look couldn't rescue sagging sales. See more muscle car pictures.

Buick's Skylark got fresh sheetmetal for 1966, and there was more available power for the Gran Sport. But competition was tougher than ever, and sales of the 1966 Buick Skylark Gran Sport, an upscale muscle car, skidded dramatically from the model's first season in 1965.

Muscle Car Image Gallery


Highlighting the new look were sloping sail panels that extended the rear roofline beyond the back window. Distinguishing the Gran Sport were a blacked-out grille, new GS emblems, nonfunctional rear-facing hood scoops, and simulated front-fender vents.

The base 401-cid "Wildcat 445" four-barrel again had 325 bhp, but a hotter 340-bhp version was made available during the model year. Dual exhausts and heavy-duty suspension were included as standard equipment with either engine. Metallic brake linings and a rear stabilizer bar were among the options.

©2007 Publications International, Ltd. The 401-cubic-inch engine in the Gran Sport, called the Wildcat 445, could make up to 340 horsepower.

A three-speed manual came with either version of the 401; a four-speed added $184, and Super Turbine automatic cost $205. Half-a-dozen axle ratios, from 2.78:1 to 4.30:1 were now offered, and a Positive Traction diff was a mandatory option with the performance cogs. Handsome $74 chrome-plated wheels were popular options, as were power steering ($95) and power brakes ($42). Buick would even delete the heater for a $71 credit.

©2007 Publications International, Ltd. The interior styling of the 1966 Buick Gran Sport was a bit stodgy.

The 340-bhp engine was tuned to run, redlining at 4600 rpm and making a peak 445 lb-ft of torque at 3200. It was nearly a second quicker to 60 mph than the base engine, and about a half-second faster in the quarter-mile. With the 3.36:1 axle, a 340-bhp GS got to 60 mph in 6.8 seconds and turned 14.9-second ETs at 95 mph.

It wasn't the fastest big-cube intermediate, but reviewers again lauded the Gran Sport's balanced nature. At $2,956 for the pillared coupe, and $3,019 for the Sport Coupe, and $3,167 for the convertible, however, base prices were higher than those of 4-4-2s and GTOs. Buick built 106,217 Skylarks for '66; just 13,816 of them were Gran Sports.

Return to Classic Muscle Cars Library.


For more cool information on muscle cars, check out:

  • Buick, GM's "gentleman's car" division, was an unlikely source of some of the finest muscle cars. See profiles, photos, and specifications of more Buick muscle cars.
  • Muscle cars came in many shapes and sizes. Here are features on more than 100 muscle cars, including photos and specifications for each model.
  • Muscle cars created their own culture. To learn about it, read How Muscle Cars Work.

Check out these profiles of muscle cars, which include photos and specifications for each model:

For related car information, see these articles:


  • The engine is what gives a muscle car its flamboyant personality. To learn everything you need to know about car engines, see How Car Engines Work.
  • Muscle cars wouldn't have much muscle without horsepower -- but what exactly is horsepower? How Horsepower Works answers that question.
  • NASCAR race cars embody the muscle car philosophy of power. Read How NASCAR Race Cars Work to find out what makes these charged-up racers go.
  • Are you thinking of buying a 2007 muscle car, or any other car? See Consumer Guide Automotive's New-Car Reviews, Prices, and Information.