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Displacement began at 287-cubic-inch (4.7 L) and grew as large as 455-cubic-inch (7.5 L) by 1970. Pontiac continued to manufacture its own engines, distinct from Buick, Cadillac, Chevrolet, or Oldsmobile, until 1981. Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines.
L30 350 cu in Pontiac V8 155 hp: L76 350 cu in Pontiac V8 175 hp: L78 400 cu in Pontiac V8 185 hp (138 kW) L75 455 cu in Pontiac "H.O." V8 200 hp [a 6] 1976: L30 350 cu in Pontiac V8 160 hp (120 kW) L76 350 cu in Pontiac V8 165 hp (123 kW) L75 455 cu in Pontiac "H.O." V8 200 hp 1977: LD5 231 cu in (3.8 L) Buick V6 105 hp (78 kW) L27 301 cu in ...
The Oldsmobile engine was very similar to the Buick engine, but not identical: it had larger wedge combustion chambers with flat-topped (rather than domed) pistons, six bolts rather than five per cylinder head, and slightly larger intake valves; the valves were actuated by shaft-mounted rocker arms like the Buick and Pontiac versions, but the ...
1970 Pontiac Trans Am 1976 Pontiac Trans Am 1978 Pontiac Trans Am 1981 Pontiac Turbo Trans Am 1987 Pontiac Trans Am The Trans Am was a specialty package for the Firebird, typically upgrading handling , suspension , and horsepower , as well as minor appearance modifications such as exclusive hoods , spoilers , fog lights and wheels.
In 1978, the Le Mans and other GM mid-sized cars were considerably downsized and lost some 600-800 lb. Pontiac's engines were also downsized, with the standard engine being the Buick 3.8 L 231 ci V6, Pontiac 265 ci V8, or optional Pontiac 4.9 L 301 ci V8 for 1978, (a Chevy 305 ci V8 in California). 1978 also saw Pontiac's 350 ci & 400 ci engine ...
The Pontiac-built OHC six-cylinder engine was replaced by a Chevy-built 250 in 3 inline six while the 350 V8 was down to a two-barrel 255 hp (190 kW; 259 PS) version. New engine offerings included 400 in³ V8s rated at 265 hp (198 kW; 269 PS) with two-barrel carburetor and 8.6:1 compression ratio or 330 with four-barrel and 10.25:1 compression.
Pontiac thought they were making the perfect high-performance luxury car in the 1970’s, but they were really producing the perfect base for a low-rider.
During the 1975-76 model years, the top engine choice was a 350 cu. in. (5.7 Liter) V8 from GM's Buick division. During that time, the base engine was the 115 hp (86 kW) 250 cu. in. (4.1 Liter) inline-6 from Chevrolet, until 1977 when it was dropped in favor of the lighter 110 hp (82 kW) Buick 231 V6. It saw few changes through its life being ...