Buick’s top 1966 Skylark performance option was the Gran Sport, built around a 401 cubic inch V8 nicknamed the Wildcat 445 after its 445 lb-ft torque rating, with horsepower ranging from 325 up to a hotter 340 horsepower version. Distinguished by blacked-out grille styling, GS badging, and heavy-duty suspension, a correctly documented Gran Sport survivor carries considerably more value today than a standard Skylark from the same year.