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The W72 offered many improvements over the standard L78 400 Pontiac. One of the key upgrades were the 6x4 heads. The standard head seen on an L78 400 Pontiac was the low compression 6x8 head, while the 6x4 head seen on the W72 had hardened valve seats for a higher RPM operating range, improved air flow, and higher compression.
Also called the GM small corporate pattern and the S10 pattern. This pattern has a distinctive odd-sided hexagonal shape. Rear wheel drive applications have the starter mounted on the right side of the block (when viewed from the flywheel) and on the opposite side of the block compared to front wheel drive installations.
As Pontiac had discontinued the 455 in the previous model year, a modified 400 Pontiac V8 dubbed the "T/A 6.6" RPO W72 with a single four-barrel 800CFM Rochester Quadrajet carburettor rated at 200 bhp (203 PS; 149 kW) at 3,600 rpm and a maximum torque of 325 lb⋅ft (441 N⋅m) at 2,400 rpm, as opposed to the regular "6.6 Litre" 400 (RPO L78 ...
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 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 Bonneville Sport Convertible F/I 4 bucket seat cnvt (1958) Pontiac Bonneville X-400 (1959–1960) Pontiac Bonneville Le Grande Conchiche (1966) Pontiac Bonneville G/XP (2002) Pontiac Cirrus (1966) Pontiac Club de Mer (1956) Pontiac Fiero Convertible (1984) Pontiac Grand Prix X-400 (1962–1963) Pontiac Grand Prix SJ Edinburgh (1972)
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The Catalina continued as Pontiac's entry-level full-size automobile with a Buick-built 231 cubic-inch V6 now standard in sedans and coupes (Safari wagons came standard with V8 power) and optional V8s of 301 CID, 350 CID and 400 CID displacements, each Pontiac-built engines and offered in all states except California. The Pontiac 350 was ...