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A 390 hp 428 V8 in a 1969 Grand Prix SJ. In 1967 the 421 was enlarged to 426.61 cu in (7.0 L) by increasing its bore to 4.12 in (104.6 mm). Both Chevy and Ford had 427 cu in performance engines, so Pontiac simply referred to its 427 as a 428 to one-up them. It retained the 421's 4 in (101.6 mm) stroke and 3 + 1 ⁄ 4 in (82.6 mm) main journal.
In the 1920s Oakland Motor Car engineers designed an all new engine for their "companion" make, the Pontiac, that was introduced in 1926.It was a side-valve design with a one piece cast iron block with three main bearings.
Being nearly identical, it too has the distinctive odd-sided hexagonal shape. These engines can be fitted in rear wheel drive vehicles with the right bellhousing and are used in hot rods, kit cars, sand rails and late model engine swaps. All Cadillac Northstar V8s; Oldsmobile Aurora L47 V8; GM 3.5L LX5 "Short Star" V6
The Grand Prix was an all-new model for Pontiac in the 1962 model year as a performance-oriented personal luxury car. [3] Based on the Pontiac Catalina two-door hardtop, Pontiac included unique interior trim with bucket seats and a center console in the front to make the new model a lower-priced entry in the growing personal-luxury segment. [3]
The location that Oakland inhabited was the original site of Cartercar when GM bought the company in 1909 by William Durant. [1] The plant ceased production of full-size Pontiacs after the 1980 model year but continued to build mid-size Pontiacs ('81-82 Grand Prix, '81 LeMans, '82 Bonneville G) until being idled on August 6, 1982. [2]
English: 1969 Pontiac Grand Prix SJ being loaded after the 2023 Greenwich Concours d'Elegance. 390 horsepower (engine code WL), manual transmission. Date 4 June 2023
This 108 cu in (1,767 cc; 1.8 L) unit is an AMC designed air-cooled V4 engine that was only used in AMC's lightweight aluminium-bodied M422 'Mighty Mite' military vehicle, built from January 1960 to January 1963 as an air transportable (by the helicopters of the time) Jeep for the U.S. Marine Corps. [1]
At the height of the horsepower era, Pontiac engines reached ratings of 390 hp (291 kW; 395 PS) (SAE gross), though other engines achieved considerably higher outputs. Federal emissions laws eventually brought the horsepower era to a close and resulted in a steady decline for Pontiac's engines. One holdout to this industry-wide slide was the ...
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