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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.
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]
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.
The Custom S came standard with Pontiac's unique overhead camshaft OHC-6 175 hp 250 in 3 engine. Also available was a 230 hp (170 kW) 265 ft⋅lbf (359 N⋅m) TQ OHC inline 6-cylinder with the "Sprint" package, a 265 hp (198 kW) overhead valve pushrod V8 350 in 3 , and a 330 hp (250 kW) version of the same engine with higher compression and a 4 ...
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
The Pontiac Ventura is an automobile model which was produced by Pontiac between 1960 and 1977. The Ventura started out as a higher content trim package on the Pontiac Catalina , and served as the inspiration for the luxury content Pontiac Grand Prix in 1962, then remained as a trim package on the Catalina until 1970.
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