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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.
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 car was a trim package of the Pontiac Le Mans, but powered by the Pontiac 400 rated at 200 hp (149 kW; 203 PS) (the T/A 6.6 "W72" version, not the base 400, which made 180). Cars specifically destined for Californian or high-altitude county dealers, featured the Oldsmobile 403 Small Block making 185 hp (138 kW; 188 PS).
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)
The Pontiac Firebird went into production contemporaneously and on the same platform as the Camaro. Pontiac entered the Trans-Am Series in 1968, and a year later introduced the Trans-Am Firebird for public purchase. This option came with Pontiac's small journal-series 400 cubic inch engine, which did not qualify for homologation.
The car's original engine was an air-cooled flat-eight engine made by using a giubo to join the crankshafts of two Volkswagen flat-four engines laid end-to-end. [ 86 ] The car's open-topped barquette -style body is said to have been made from either a modified Lorena GT body or a mold taken of a Lorena GT owned by the Oliveiras.
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So, in addition to building a new Pontiac Engineering building in 1949–1951, the decision to re-direct the V8 to an OHV design delayed its introduction until the 1953 model year, however, the Buick division was introducing its new engine (Nail valve V-8) in 1953 and asked the corporation to hold back or delay Pontiac's V8 introduction until ...