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Why the Sierra Classic 454 became GMC’s heavy hitter
Collectors chase the GMC Sierra Classic 454 because it captures the last gasp of big-block torque in a square-body truck.
Fast Lane Only on MSN
Why the SP 454 remains one of GMC’s wildest moves
GMC’s Sprint SP 454 arrived during Detroit’s peak muscle era, yet it slipped into obscurity while its Chevrolet cousin stayed ...
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