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A Buick GSX built during a five-month factory window in 1970 raises a genuine documentation question for its current owners — one that even a close look at the car’s trim and colors can’t fully settle. Its Stage 1 engine option carried an official rating widely considered too conservative for what the car could actually do. Here’s the open question at the center of this particular GSX.
Erika Perrye had only owned her 1970 Buick GSX for a few months when Lou Costabile caught up with her and husband Bob in Lake Zurich, Illinois — but she already had strong opinions on why Buick’s most overlooked muscle car beats the obvious choices. Finished in bold Saturn Yellow with the torque-heavy 455 V8, this GSX is one of the rarest performance cars Buick ever built. Find out how a rare yellow Buick turned her into a genuine muscle car fan.