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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.
The shakers had a "6.6 Litre" decal for all L78 Pontiac 400 and L80 Oldsmobile 403 engines. Only the optional W72 Pontiac 400 received the "T/A 6.6" decal. [39] As Pontiac had discontinued the 455 in the previous model year, a modified 400 Pontiac V8 dubbed the "T/A 6.6" with the RPO W72 became available as a pay-extra upgrade to the standard ...
Pontiac produced 7,500 10th anniversary cars, of which 1,817 were equipped with the high-output Pontiac T/A 6.6 W72 400 engine. Two 10th anniversary Trans Ams were the actual pace cars for the 1979 Daytona 500, which has been called the race that made NASCAR.
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 ...
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 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.