The 1970 Buick GSX Stage 1: The Muscle Car Missing From Buick’s Own Catalog by Jack Harmon Only 678 Buick GSXs were built in 1970, and sources still disagree on how many were Stage 1. Here is what the torque, the stripe and the numbers really say. Share this: Share on Facebook (Opens in new window) Facebook Share on X (Opens in new window) X Email a link to a friend (Opens in new window) Email Share on Pinterest (Opens in new window) Pinterest Share on LinkedIn (Opens in new window) LinkedIn