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This Grand Prix is a first-year third-generation model. 1969 marked the introduction of the J and SJ nomenclature, which was ...
The H.O. Grand Prix SJ could get from 0-60 in under seven seconds and turn quarter-mile times in the mid-14s, but the 428 yielded to a 370-horsepower, 455 cubic inch V8 for the 1970 model year.
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