This 1963 Pontiac Grand Prix ... 4-liter) V8 that produced 303 horsepower in four-barrel form or 330 horses with the Tri-Power setup. However, this example was specified with the option of a 421 ...
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5 Of The Most Powerful Engines Ever Put Into The Pontiac Grand PrixThe most powerful engine in 1963 and 1964 -- after the Super Duty option was cut -- was the same 421-inch beast topped with three two-barrel carbs in Pontiac ... Grand Prix, and the model's four ...
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