The 322 was also used in the 1956 through 1957 10,000-Series conventional cab Chevrolet heavy duty trucks. Buick's second variation of the nailhead was produced from 1957–1966. The 364 was introduced in 1957 and produced through 1964. The Special came standard with 2bbl carb and , where all others had the 4bbl, engine. Buick, like most of its competitors, continued to expand their durable V8 engine to larger displacements, such as the (bore by stroke) . The 364 was enlarged to and produced from 1959 to 1966. Originally a 401, it was later redesignated a 400 to meet 1960s GM directives for maximum displacement engines in mid-size cars. The 401/400 became Buick's full-size and later intermediate muscle car powerplant of choice, used in the company's Skylark Gran Sport and Buick Wildcat models, among others. The engine was variously designated the Wildcat 375, Wildcat 410, and Wildcat 445 depending on the foot-pounds of torque each version produced. The Wildcat 410 was the two-barrel carbureted engine, standard on the 1962-63 LeSabre. The Wildcat 375 was a no-cost option for the 1962-63 LeSabre that used a lower compression ratio to run on lower-octane fuel. The various Wildcat engines had decals on their air cleaners indicating their version; however, the four-barrel edition of the 1966-67 small-block Buick 340 V8 was also labeled Wildcat 375 on its air cleaner, but was not a nailhead engine. The Wildcat 445, with a single four-barrel carburetor, was the standard engine in the Invicta, 1959-1966 Electra, 1962–1966 Buick Wildcat, 1963 Riviera and 1965 Riviera (the 1964 and 1966 Riviera models used the 425 with a single four-barrel carburetor, labeled Wildcat 465, as standard equipment). Mounted on a trolley, Buick 401s were also used as starter motors for the SR-71 Blackbird supersonic jet. In an effort to overcome the restrictive exhaust-port design of the nailhead, Buick drag racing enthusiasts in the 1960s adapted superchargers with a custom camshaft to feed intake air in through the exhaust ports; the larger intake ports became the exhaust outlets. The was produced from 1963 to 1966. The largest-displacement version of the nailhead, it began as an option on the 1963 Riviera and was later available on the Wildcat and Electra models.