Buick Called It a “Hemi Killer” – Meet the 1970 GSX That Actually Backed It Up by Muscle Car Fan Buick’s 1970 GSX packed a 455-cubic-inch Stage 1 V8 with a torque rating that beat the 426 Hemi on paper. It came from a brand nobody expected to build a legitimate street fighter. Here is the story behind Detroit’s most underrated muscle car.
