Buick doesn’t get much credit in muscle car conversations, but the 1966 Skylark Gran Sport deserves a seat at the table. Under a blacked-out grille and understated trim sat a 401-cid Wildcat V8 making up to 340 horsepower and a wall of low-end torque that GTOs couldn’t match off the line. Buick built over 106,000 Skylarks that year — only 13,816 wore the GS badge. This one’s a sleeper in every sense.
That’s what we call PASSION!!
Buick doesn’t usually come up when muscle car talk turns to 1966, and that’s exactly the mistake this Skylark is here to correct. Underneath GM’s classiest badge sat a genuine street brawler that year, wearing a blacked-out grille and a set of nonfunctional hood scoops that dared you to underestimate it. Buick built well over a hundred thousand Skylarks for ’66, but only a fraction wore the Gran Sport badge that actually backed up the attitude. What was Buick hiding under that hood that made the GS worth chasing over a GTO or a 4-4-2?
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The Nailhead’s Last Stand
The ’66 GS ran Buick’s 401-cid “Wildcat 445” big-block — officially rebadged as the “400” once GM capped intermediate engines at 400 cubic inches — putting out 325 horsepower in base trim and 340 in the hotter option, with a monstrous 445 lb-ft of torque at just 3,200 rpm. That torque number is what separated Buick’s approach from the competition: a 340-horse GS would run 0-60 in around 6.8 seconds and turn a 14.9-second quarter-mile at 95 mph, not because it revved hard, but because it hit like a freight train off idle. 1966 also marked the end of the line for the “nailhead” V8 design that had powered Buicks since 1953 — this was its swan song, going out with real muscle car credentials attached.
Understated on Purpose
Where the GTO shouted, the GS whispered — blacked-out grille, GS emblems, simulated fender vents, and not much else to give it away, which is exactly why it’s such a sleeper today. Buick built 106,217 Skylarks in 1966, but only 13,816 wore the Gran Sport badge, split across coupe, sport coupe, and convertible body styles — genuinely rare compared to the GTOs and Chevelles rolling off the same GM assembly lines.
Sales actually dipped from the GS’s debut year in ’65, a sign that Buick’s more buttoned-down image made it a tougher sell against flashier rivals — but that same restraint is why a numbers-matching ’66 GS still turns heads at a show today. It doesn’t look like it’s trying, and that’s the whole point.
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As an owner of a vintage Buick I have long seen this marquee as an underrated contender in the muscle car ranks. So glad to see this used as a part of his vision!