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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 addition to the 1970–71 L.A. Dart, Shrewsberry still owns his 1972 L.A. Dart funny car with flip-up body, his original 1963 Super Duty Tempest (one of only four remaining), the 1965 Hemi Under Glass Barracuda, the Knott's Berry Wagon, a 1964 Mercury Comet Caliente 427 which he raced in A/FX that year with Jack Chrisman (one of only 50 ...
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
And although Oldsmobile and Buick offered pillarless hardtops on the Cutlass and Skylark respectively, Pontiac did not offer a pillarless hardtop LeMans model. In 1963, the LeMans became a separate series; its sales were nearly 50 percent of combined Tempest and Le Mans production. 1963 models, referred to as senior compacts, were slightly ...
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.
One holdout to this industry-wide slide was the Super Duty 455 engine of 1973–1974. Available only in the Firebird Formula and Trans Am models, this was rated at 310 hp (230 kW) net initially but after having issues passing EPA emissions tests, the camshaft was changed to the old RA III cam, and with the change, came a 290 hp (220 kW) net rating.
The Trophy 4 engine is a short-stroke, 45-degree inclined [4] inline four created from the right bank of the 389 V8 for the debut of the Tempest in 1961. Its 194.43 cu in (3.2 L) displacement is precisely half of the 389, with an identical bore and stroke of 4 + 1 ⁄ 16 in × 3 + 3 ⁄ 4 in (103.2 mm × 95.3 mm).
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