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Buick Muscle Cars 1955–1990
Every Buick muscle car 1955–1990 — model lineup, engine specs, production numbers, values and restoration guides.
Buick built the era's most understated fast cars: the GS 400 and GSX Stage 1 of the late 1960s, then the turbocharged Grand National and GNX of the 1980s. Stage 1 and GNX cars carry substantial premiums, and both eras are supported by strong specialist parts networks.
Buick models covered in detail here include 1984–1987 Grand National / GNX. Every entry lists factory engine options, power and torque ratings, production numbers, original MSRP and current 2026 collector values, together with the specific rust areas and mechanical faults to inspect before buying.
Models, Specs and 2026 Values
- 1984–1987 Buick Grand National / GNX — 231ci (3.8L) Turbo V6, 245–276 hp (300+ actual). Current value $35,000–$65,000 (Grand National); $80,000–$150,000 (T-type); $130,000–$250,000+ (GNX).
Frequently Asked Questions
Which Buick muscle car is the most valuable?
Among the Buick models covered here, the highest current values belong to the rarest documented engine and option combinations. Individual 2026 value ranges are listed on each model page, and originality with supporting paperwork is the single biggest price factor.
How much does a classic Buick muscle car cost in 2026?
Buick values in 2026 span from affordable driver-quality cars in the low tens of thousands to six-figure documented rare-engine examples. Each model page on this site lists a current value range along with original MSRP for comparison.
Are parts still available for classic Buick muscle cars?
Reproduction sheet metal, trim and mechanical parts are widely available for the most popular Buick models, while low-production models rely more on used original parts. Our restoration guides cover which suppliers are reliable and where reproduction quality varies.