Pontiac’s Grand Prix SJ 455 sits at the crossroads of luxury and muscle, combining big-block torque with personal-coupe comfort in a way few rivals matched. Collectors today chase these cars not just ...
Back in 1970, Pontiac introduced a series of changes to the engine lineup available on the Grand Prix, replacing the 428ci (7.0-liter) previously sold as optional for MY 1969 with a new 455ci ...
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