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The Tempest was the result of a decision by the Pontiac division to enter the compact car market following the success of the Chevrolet Corvair. [4] The division wanted to produce a clone of the Corvair, but instead GM gave Pontiac the lead to develop a new car in an interdivisional program coded named "X-100."
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 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).
The Tempest also used an independent rear swing axle suspension similar to the rear-engine Chevy Corvair while the Buick and Olds compacts featured a conventional rear coil spring suspension. For 1963, Pontiac replaced the Buick-sourced 215 aluminum V8 with a Pontiac built 336 cubic-inch V8 as the top power option for the Tempest.
In 1963 Pontiac dropped the Buick division built 215 cu. in. aluminum V8 it had offered in the Tempest and replaced it with a small-bore version of the standard 389 cu in (6.4 L) Pontiac V8. It shared the 389's 3 + 3 ⁄ 4 in (95.3 mm) stroke, but its bore was 3.78 in (96.0 mm) for a displacement of 336.66 cu in (5.5 L).
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The Tempest line was changed to an intermediate-sized car on the new GM A platform for the 1964 model year. The LeMans was its own model, as in 1963, and included carpeted lower door panels, a deluxe steering wheel, courtesy lighting, and full wheel covers. For the 1964 model year, a two-door hardtop was added.
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.
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