When you think of big-block muscle cars from the ’60s, Buick might not be the first brand that comes to mind. But beneath the surface, Buick quietly produced some serious big-block power that flew under the radar compared to Chevy and Ford. These cars weren’t always the loudest or flashiest, but they packed impressive punch and often had a more refined feel. Here’s a look at 10 Buicks from the ’60s and early ’70s that carried big-block engines and deserve more credit than they usually get.
1964 Buick Wildcat with 401 Nailhead V8
The ’64 Wildcat came with Buick’s 401 cubic-inch Nailhead V8, delivering 325 horsepower and a hefty 445 lb-ft of torque. It wasn’t a lightweight by any means, tipping the scales near 4,000 pounds, but the torque-heavy Nailhead made it a strong cruiser with surprising mid-range power.
Inside, the Wildcat had a comfortable and roomy interior with bucket seats and woodgrain accents that leaned toward luxury more than straight muscle. This combo of size, power, and comfort made the ’64 Wildcat a sleeper among muscle cars of the time.
1965 Buick Skylark GS 401
The 1965 Skylark GS offered the 401 Nailhead as its big-block option, rated at 325 horsepower. It was paired with a three-speed automatic or a four-speed manual, giving drivers a balance between muscle car fun and daily usability.
Its unassuming looks often led to underestimation, but the big torque numbers and solid suspension made it quick off the line and stable in corners. The interior was simple yet functional, with sporty bucket seats and a straightforward dashboard layout.
1966 Buick GS 400
The 1966 GS 400 used Buick’s all-new 400 cubic-inch big-block—not a Nailhead—rated at 340 horsepower. This marked the beginning of a new engine family for Buick, featuring better breathing heads and more conventional internals.
Performance-wise, the GS 400 could hit the quarter-mile in the mid-14-second range, thanks to its ample torque. Inside, it had sporty touches like a center console, Rally gauges, and optional vinyl bucket seats to complete the muscle package.
1967 Buick GS 400
In ’67, Buick stuck with the newer 400 cubic-inch big-block, maintaining output around 340 horsepower. Improved carburetion and tuning made it a touch livelier than the previous year.
The GS 400 also got more aggressive styling, with bold stripes and optional Rally wheels. The interior featured high-back bucket seats and woodgrain trim, combining muscle car performance with a more refined cabin feel.
1968 Buick GS 400
The ’68 GS 400 continued with the same 400 big-block V8, still rated at 340 horsepower. It was paired with either a 3-speed manual or a 3-speed Turbo Hydra-Matic automatic and marked the final year for this engine before Buick stepped up to the 455.
With a curb weight around 3,800 pounds, the GS 400 could still hustle thanks to its torque-rich engine. The interior mixed sport and comfort with optional center consoles and Rally gauges, keeping things driver-focused but not spartan.
1969 Buick GS Stage 1 400
The 1969 GS Stage 1 400 was where Buick started getting more serious. The Stage 1 package added a hotter cam, revised timing, and bigger breathing parts, bringing horsepower to around 345–350 and torque in the 440–460 lb-ft range.
Performance numbers were strong for the time, with quarter-mile runs in the low 14s. The car had aggressive styling cues, including hood scoops and stripes. Inside, the interior was sporty, with Rally gauges and optional leather seating adding to the muscle vibe.
1969 Buick Wildcat with 455 V8
While not a GS, the ’69 Wildcat offered Buick’s big 455 cubic-inch V8 rated at 350 horsepower and a monster 510 lb-ft of torque. This was the first year for the 455, and it brought serious grunt to Buick’s full-size lineup.
The Wildcat’s interior was plush compared to typical muscle cars, featuring thick upholstery, wood accents, and a spacious cabin. It showed how Buick mixed muscle power with luxury comfort, making it a unique player in the big-block scene.
1970 Buick GSX with 455 V8
The 1970 GSX is probably the best-known big-block Buick muscle car, with its 455 cubic-inch V8 delivering up to 360 horsepower and 510 lb-ft of torque. The Stage 1 version was a genuine street threat, capable of mid-13-second quarter-mile times.
Besides the power, the GSX stood out with bold graphics, aggressive spoilers, and Rally wheels. The interior kept it performance-focused with bucket seats, woodgrain accents, and a driver-centric layout that balanced muscle and comfort.
1967 Buick Riviera with 430 V8
The Riviera was Buick’s personal luxury coupe, but it could be fitted with the 430 cubic-inch V8 making 360 horsepower and 475 lb-ft of torque. This engine replaced the Nailhead and brought more top-end power and improved drivability.
Performance wasn’t just about straight-line speed—the Riviera’s longer wheelbase and more refined suspension gave it a smooth yet powerful ride. The interior was upscale with leather seats and advanced features for the era, showing Buick’s ability to blend power with sophistication.
1965 Buick Electra 225 with 401 V8
While often overlooked as a big luxury sedan, the Electra 225 offered the 401 Nailhead V8 with 325 horsepower and 445 lb-ft of torque. Its large size didn’t stop it from having decent acceleration for the time, especially with that torque on tap.
The Electra’s interior was roomy and richly appointed, with plush seating and a host of comfort options. It’s a reminder that Buick’s big-block engines weren’t just for sports cars—they powered some heavyweight cruisers with surprising punch.
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