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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.
Pontiac, or formally the Pontiac Motor Division of General Motors, was an American automobile brand owned, manufactured, and commercialized by General Motors. It was originally introduced as a companion make for GM's more expensive line of Oakland automobiles. [ 3 ]
The 400 is the only engine that uses a 2.65 in (67.3 mm) main bearing journal and a 2.1 in (53.3 mm) rod bearing journal. The connecting rod was also 400 specific being 5.565 in (141.4 mm) as opposed to the 5.7 in (144.8 mm) rod used in all other small-block Chevrolet engines.
The 1966-1967 4-4-2 400 cu in (6.6 L) V8 was a short stroke engine which featured B and C cast large-valve cylinder heads and hydraulic lifters of larger diameter, as well as push-rods of different length and diameter than the standard Olds Rocket V8.
A Silver streak 8 in a 1949 Pontiac Streamliner - note the large intake silencer leading to an oil-bath air cleaner on the left side of the engine. The Pontiac straight-8 engine is an inline eight-cylinder automobile engine produced by Pontiac from 1933 to 1954. Introduced in the fall of 1932 for the 1933 models, it was Pontiac's most powerful ...
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)