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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.
At the height of the horsepower era, Pontiac engines reached ratings of 390 hp (291 kW; 395 PS) (SAE gross), though other engines achieved considerably higher outputs. Federal emissions laws eventually brought the horsepower era to a close and resulted in a steady decline for Pontiac's engines. One holdout to this industry-wide slide was the ...
Automobile engines produced by the Pontiac division of General Motors. Pages in category "Pontiac engines" The following 8 pages are in this category, out of 8 total. ...
The Pontiac straight-6 engine is a family of inline-six cylinder automobile engines produced by the Pontiac Division of General Motors Corporation in numerous versions beginning in 1926. "Split Head" Six
The Pontiac Parisienne is a full-size rear-wheel drive vehicle that was sold by Pontiac on the GM B platform in Canada from 1958 to 1986 and in the United States from 1983 to 1986. Right-hand drive models were locally assembled in Australia, New Zealand, and South Africa until 1969.
The Trophy 4 engine is a short-stroke, 45-degree inclined [4] inline four created from the right bank of the 389 V8 for the debut of the Tempest in 1961. Its 194.43 cu in (3.2 L) displacement is precisely half of the 389, with an identical bore and stroke of 4 + 1 ⁄ 16 in × 3 + 3 ⁄ 4 in (103.2 mm × 95.3 mm).
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 ...
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 ...