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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.
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 ...
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 ...
The Pontiac Executive is an automobile model that was produced by Pontiac from 1967 to 1970. [1]The Executive name replaced Pontiac's long running mid-range Star Chief, beginning for 1966 when all Pontiacs in this range were named Star Chief Executive for this one year only, before the series became simply the Executive for 1967.
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 ...
Pontiac thought they were making the perfect high-performance luxury car in the 1970’s, but they were really producing the perfect base for a low-rider.
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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.