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By 1971 the muscle car era was already cooling off, and Buick’s Gran Sport had to adapt to new fuel and emissions realities without losing its identity. This GS 350 survived that transition looking sharp, one of a shrinking number left from a production run that barely broke nine thousand cars. Here is what made the 1971 GS a genuinely interesting footnote in Buick’s performance history, not just a leftover from better years.
Buick’s Grand Sport looked like just another understated mid-size coupe, but hidden under the hood was a factory horsepower rating that dyno testing proved was flat-out wrong. From the 401-cubic-inch nailhead that skirted GM’s own displacement rules to the Stage 1 package that quietly outran its own spec sheet, the Grand Sport built a reputation on performance nobody advertised. Read on to find out how Buick kept one of its quickest cars a well-kept secret for six model years.
Motor Trend gathered eight of Detroit’s newest performance cars for a single comparison test, and one entry completely upended what the rest of the segment was trying to be. Every other car in that lineup had spent years adding comfort and insulation on top of a potent engine. Plymouth’s Road Runner did the opposite, stripping everything back and betting that buyers wanted less. The magazine’s verdict is still quoted today, but the timing slips underneath the praise told a more complicated story. Read on for what the numbers actually said.
A 1971 Buick GS Stage 1 Convertible, described as looking just as it did the day it left the showroom, gets the full 4K treatment at the Muscle Car and Corvette Nationals. Buick’s factory performance package turned this GS into a genuine competitor against Chevelle SS and GTO buyers of its era. Watch to see a rare survivor convertible that barely shows its age.
Only 5,718 Riviera Gran Sports were built for 1966, a personal luxury coupe hiding a 425-cubic-inch Nailhead V8 rated at 340 horsepower, with an optional twin-carburetor setup pushing it to 360. Buick marketed the GS around ride and handling rather than what was under the hood. Values have historically trailed flashier muscle cars despite genuinely rare production numbers. Read on to find out why the overlooked Riviera GS may be the best value in sixties Buick performance.
Buick is not the first name most people reach for when the conversation turns to the quickest muscle cars of 1970 — which is precisely the mistake the Stage 1 package existed to correct. A GM rule change that year finally let Buick drop a full 455 into a midsize car, and period testers recorded quarter-mile times that embarrassed far louder reputations. Convertibles were rarer still. Read on for the numbers behind the most underrated muscle car of 1970.