That is the case with this 1971 Pontiac Grand Prix SJ. Its exterior looks stunning, but the original 455ci V8 under the hood means that it has the performance credentials that prove it is more than a pretty face. ... Thomas Young. Oct 20, 2021 at 3:24pm. Saw that right away, it should have. My 1970 SJ did. 1 . Reply. Keith. Oct 18, 2021 at 8 ...