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The 421.19 cu in (6.9 L) was introduced in 1961 as a dealer-installed Super Duty option. Unlike previous enlargements of Pontiac V8s, it did not replace the 389. The first of the "big journal" Pontiac V8s, it had a bore and stroke of 4 + 3 ⁄ 32 in × 4 in (104.0 mm × 101.6 mm) and came with dual four-barrel carburetors.
In 1963 the CSI (Commission Sportive Internationale - the FIA’s regulatory body) lifted the 4.0 litre engine restriction on its GT classes, as well as introducing a sliding scale for minimum weight versus engine size. That change again opened the field to large American V8s, used on the AC Cobras and Lola Mk6 that year.
The Pontiac LeMans / l ə ˈ m ɑː n z / is a model name applied to automobiles marketed by Pontiac.The name came from the French city of Le Mans, the site of the 24 Hours of Le Mans, the world's oldest active sports car endurance race that began in 1923.
For 1963 only, Pontiac offered the 421 cu in (6.9 L) Super Duty with two four-barrel carburetors, rated at 425 hp (317 kW), as a US$2,250 option ($22,104 in 2023 dollars [5]) whereas the base Bonneville was listed at US$3,349 ($33,330 in 2023 dollars [5]). [14] 1963 Pontiac Bonneville sport coupe
However, for 1964, the engine's displacement was adjusted so that it actually was 326 cubic inches, making the 1963 "326 V8" a single-year engine. The cast-iron V8 engine increased the Tempest's weight by 260 lb (120 kg) over the weight of a Tempest equipped with a Trophy 4 engine; front/rear weight distribution changed somewhat to 54/46.
The designation 2+2 was borrowed from European sports car terminology, for a seating arrangement of two in front plus two in the rear. It was designated officially at Pontiac as a "regular performance" model, [2] a thoroughly confusing designation for a vehicle that was clearly intended to be to the Catalina platform what the GTO was to the A-body Lemans: the standard drivetrain was a 2-barrel ...
Introduced in 1963 on Pontiac's 389 and 421 cu in (6.4 and 6.9 L) drag racing engines, General Motors fitted it to the 1967 Z/28 before they used it on the L88 427 cu in (7.0 L) Corvette. It eliminated the production breaker-point ignition allowing greater spark energy and more stable ignition timing at all engine speeds including idle.
A 363 hp (271 kW) engine was offered to drag racers. Late in the 1961 sales season the 421 cu in (6.9 L) Super Duty was released for sale as a dealer installed engine. The 1961 models never came from the assembly line with the 421ci engine; instead it was a specialty item installed and sold at the discretion of individual dealers.