Pontiac Bonneville Cabriolet

The Pontiac Bonneville is an automobile built by the Pontiac division of General Motors from 1957 to 2005. It was introduced as a limited production performance convertible during the 1957 model year. The Bonneville (known as the Parisienne in Canada until 1981), and its platform partner, the Grand Ville, are some of the largest Pontiacs ever built; in station wagon body styles they reached just over 19 feet (5.8 m) long, and were also some of the heaviest produced cars at the time (2.5 tons, or 5,000 lb (2,300 kg).
In its third year, the 1959 Bonneville became a full top-line series with the addition of the four-door hardtop sedan and Safari station wagon body styles. The Bonneville differed from its lesser Catalina and Star Chief counterparts by featuring more luxurious interior trim with upgraded. Beginning in 1964, a Bonneville Brougham option package was available that included an even more luxurious interior trim level with front and rear seats featuring center armrests, upgraded door panels and a standard Cordova (vinyl) roof with "Brougham" nameplates.
Bonneville models were standard equipped with Hydra-Matic (through 1964) or Turbo Hydra-Matic (1965-on) automatic transmissions. Other options included power steering and power brakes as well as air conditioning. Other popular options included power windows, power seats, radio, cruise control, and 8-lug aluminum wheels that included integral brake drums for improved stopping power. Pontiac full-size performance reached its peak in 1966. All full-size models got new sheetmetal for 1963, including stacked headlights. Performance enthusiasts once again turned to the Catalina, the lightest of the Pontiac full-size coupes. The standard engine was a 389 cu in (6.4 L) V8 with 283 bhp (211 kW). Next up were two 421 cu in (6.9 L) V8s with 10.75:1 compression ratios: a four barrel making 353 hp (263 kW) and the Trophy 421 HO (High Output) with triple Rochester two-barrel carburetors operated by a progressive throttle linkage, rated at 370 bhp (280 kW). For serious drag strip use, buyers could specify the Super Duty 421 which came in three states of tune which all benefited from an increase in the compression ratio from 11.0:1 to 12.0:1 and an increase in the maximum shift point from 5900 rpm to a screaming 6400 rpm. Straight-line ETs ruled the showrooms during the muscle car era and the early Pontiacs had impressive numbers. A General Motors corporate edict that took effect with the 1967 model year led Pontiac to discontinue the Tri Power engine options on all of its cars. That year also brought a larger 400 cu in (6.6 L) V8 as the standard engine for Bonneville and other full-sized Pontiacs to replace the previous 389, while the 421 cu in (6.9 L) V8 was replaced by a new 428 cu in (7 L) engine that offered as much as 390 horsepower (290 kW). For 1969, a 360 hp (270 kW) 428 became the standard Bonneville engine, which in turn was replaced for 1970 by an even larger 455 cu in (7.5 L) V8 rated at 370 hp (280 kW). Characteristics. Body.  Length/width/height/wheelbase – cm (in) : 573/202/138/320 (225.6/79.5/54.3/126); weight : 1990 kg (4392 lbs).
Engine : V8 7462 cc (455 cid), front-mounted, 3-speed, automatic, rear-wheel drive; power : 188 bhp @ 4000 rpm. Top speed : 190 km/h (118 mph).