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The Pontiac V8 engine is a family of overhead valve 90° V8 engines manufactured by the ... For 1967 only Pontiac called this engine the Quadra-Power 428. It was ...
Royal Pontiac, located in Royal Oak, Michigan, offered a 428/Royal Bobcat conversion of the 1968 GTO. For $650.00 a 390-horsepower 428 cu in (7.0 L) engine replaced the 400. The 428 cu in (7.0 L) engine was disassembled and blueprinted to produce more than the advertised factory 390 horsepower and capable of 5,700 rpm.
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 ...
The ten horsepower increase over 1968's engines was due to a different cam and the use of the #48 big valve heads, the same head used on the Ram Air 3 400-cubic inch 366 hp (273 kW) engine and the 428-HO engine at 390 hp (291 kW). The 1969 model year would be the last high-performance version of the Pontiac 350.
Power was upgraded to 340 horsepower on the base 400 CI engine, up from 333 on the 1967 model year, the 428 CI engine remained an option In 1969, the rest of the Bonneville's styling was updated. The front fascia stayed similar to 68', however, the rest of the car saw a restyle.
Engine: 400 cu in (6.6 L) Pontiac V8 428 cu in (7.0 L) Pontiac V8 455 cu in (7 ... The Pontiac Executive is an automobile model that was produced by Pontiac from 1967 ...