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From 1955 to 1981 the Pontiac Division of General Motors manufactured its own V8 engines, distinct from Buick, Cadillac, Chevrolet, or Oldsmobile. Displacement began at 287cuin and grew as large as 455cui(7.5L) by 1970.
Pontiac's engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. From 1955 through 1959 Pontiac's V8 was also used in GMC pick-up trucks.
Contents
1 History
2 Design
3 Engine Development: Small Journal Engines
3.1 287
3.2 316
3.3 336
3.4 347
3.5 370
3.6 389
3.7 326
3.8 400
3.9 350
3.10 303
3.11 366
3.12 301
3.13 265
4 Engine Development: Large Journal Engines
4.1 421
4.2 428
4.3 455
5 Ram Air
5.1 Ram Air
5.2 Ram Air II
5.3 Ram Air III
5.4 Ram Air IV
5.5 Ram Air V
6 The Super Dutys
6.1 SD389
6.2 SD421
6.3 SD455
6.4 SD4
7 Pontiac HO engines
7.1 326 HO
7.2 350 HO
7.3 400 T/A 6.6
7.4 400 HO
7.5 421 HO
7.6 455 HO
7.7 301 HO
8 Pontiac Experimental V8 Engines
8.1 427 Hemi SOHC
8.2 421 2 Valve SOHC
8.3 3 Valve SOHC
8.4 389 4 Valve DOHC
8.5 Aluminum right 400
9 Pontiac Four-Cylinder
9.1 195
10 See also
11 References
//
History
The development
Pontiac's OHV V8 dates back to 1946, when engineers began considering new engine designs for postwar cars. Despite these experiments, the division's conservative management saw no immediate need to replace the Pontiac Straight-8 engine, which had served well since 1933. When Robert Critchfield took over as general manager in 1952, however, he launched an ambitious plan to move Pontiac into the upscale, mid-range market segment occupied by Oldsmobile, and that demanded V8 power. The development of the new engine was fast-tracked, but since its relatively late development let it take advantage of the experience gained in the Oldsmobile V8 engine and Cadillac V8 engine, it was remarkably free of teething problems. The main innovation of the Pontiac engine was the stamped rocker-arm system, which had been devised by Pontiac engineer Clayton Leach in 1948. At the request of Ed Cole, general manager of Chevrolet, the layout was also used by the Chevrolet V8 released in 1955, an exception to the customary GM policy of allowing a division one year of exclusive use of an internally developed advance.
Federal emissions standards and the drive towards "corporate" engines shared among all GM divisions led to the progressive demise of the Pontiac V8 in the late 1970s. The last Pontiac V8, a 301, was produced in 1980 for a 1981 automobile.
Pontiac also had a V8 engine used in 1932 only. During 1951-1952, Pontiac had 23 1953 model production prototypes running tests on the GM proving grounds. These 23 cars were equipped with the new 287 V8 engine. Pontiac planned to produce the 1953 models with the V8, but Buick and Oldsmobile feared a sizeable loss in customers, if they had to compete with Pontiac having a new V8 engine. After hearing from Buick and Oldsmobile, GM's board of directors ordered Pontiac to delay the V8 introduction until 1955. Pontiac's V8 development that started in 1946. It was a 269-cubic-inch L head design. The 287 cuin overhead design started in 1951. Pontiac engineers tested their 269 V8 in 1949 or 1950 against a downsized Olds rocket V8 overhead engine. The Olds engine was a 303 cuin, Pontiac reduced the size to 270 cuin for testing against the 269 engine. The test results showed Pontiac that a L head engine couldn't compete with the overhead engines.
Design
The Pontiac V8 was an overhead valve engine with wedge combustion chambers. It used cast iron cylinder heads and a cast-iron block. An innovative design feature was mounting the rocker arms on ball pivots on studs set into the cylinder head, rather than using a separate rocker shaft; this allowed more consistent valve action with less weight than a conventional shaft. All (except the 303 Ram Air V engine and 265 and 301) used 6.625 in (168.3mm) connecting rods. All Pontiac V8s from 1955 to 1959 were reverse cooled, known as the "gusher" cooling system. It was removed from the design for the 1960 model year due to the fact that pontiac needed to move the generator and the power steering pump from atop the front of the engine down to the front of the heads due to the hoodline getting lower.
Most iterations had an overall length (to the edge of the water pump pulley) of 28.25 in, an overall width of 27 in, and a height (not including air cleaner) of 31 in (718mm 686mm 787mm). Dry weight ranged from 590lb (270kg) to 650 lb (270 to 295kg), depending on displacement and year. Most Pontiac engines were...(and so on)

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