We found 5 1970 Buick GSX and GS 455 listings across ClassicCars.com and Streetside Classics — here’s what’s available right now and what the market looks like.
The GSX is the car that convinces people Buick used to build muscle cars on purpose, not by accident. Only 678 were built for 1970, and the option package that turned a garden-variety GS 455 into a GSX — Rallye Ride Control suspension, the hood-mounted tachometer, dual sport mirrors, front and rear spoilers — cost buyers $1,196, which was real money on top of an already expensive car. That scarcity has caught up with the market hard over the last few years: a numbers-matching GSX Stage 1 crossed the block at Mecum Indy this past May for $90,200, and the record sale for a documented Stage 1 example sits north of $236,000. What surprised us doing this search wasn’t the top end, though — it’s how fast genuine GSX and Stage 1 GS 455 inventory disappears. We tracked down more sold examples this month than available ones, at Volo Auto Museum, RK Motors, Skyway Classics, and a well-known California dealer — every single one already gone by the time we checked the listing. If you want a real GSX, you are not shopping a leisurely market.
This month’s search turned up 5 verified listings ranging from $24,995 to $56,900, split between ClassicCars.com and Streetside Classics’ Charlotte, Atlanta, and Fort Worth locations. This is a genuinely thin market right now — true GSX production numbers and the small pool of GS 455 Stage 1 cars mean there simply aren’t many changing hands at once, and we’re being upfront that most of what came up in our research this week had already sold. The standout of the group is a documented “1 of 2,465” 455 Stage 1 in Clarkston, Michigan at $56,900 with GS Historical Society paperwork, while the entry point is a Streetside Classics Atlanta example at $24,995 — a reminder that “GSX” badging on a listing title doesn’t always mean the real A9 option package, so read closely before you get excited about a price that looks too good.
Current 1970 Buick GSX Listings
These come from ClassicCars.com and Streetside Classics’ dealer network, re-verified at draft time to confirm they’re still active.
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1970 Buick Gran Sport 455 Stage 1 — $56,900
Raven Black • 48,000 miles • ClassicCars.com
Listed as “1 of 2,465 455 Stage 1’s Ever Built,” documented by the GS Historical Society, with the Quadrajet 4-barrel, MSD ignition, and a 12-bolt 3.64 limited-slip rear end. Sold by Southern Motors in Clarkston, Michigan — this is the most thoroughly documented car in this month’s list and priced accordingly.
1970 Buick GS 455 Stage 1 (Bamboo Cream) — $46,995
Bamboo Cream • Streetside Classics (Charlotte, NC — stock 3325-CHA)
Marketed as a matching-numbers Stage 1 car with documentation including the original window sticker — worth asking Streetside directly for the paperwork before you get too far into a purchase conversation, since “documented” can mean different things dealer to dealer.
1970 Buick GS 455 — $34,995
Streetside Classics (Fort Worth, TX — stock 3708-DFW)
A straightforward GS 455 without Stage 1 or GSX documentation in the listing — priced like what it is, a solid driver-grade Gran Sport rather than a numbers-matching investment piece. Worth a look if you want the 455’s torque without paying GSX premium money.
1970 Buick GS 455/GSX — $49,995
Streetside Classics (Charlotte, NC — stock 2334-CHA)
Listed under the combined “GS 455/GSX” title Streetside uses across several of their Gran Sport listings — confirm with the dealer whether this is a real A9-package GSX or a GS 455 wearing GSX-style stripes and a spoiler before this price makes sense to you. The 455 in these cars made a genuinely absurd 510 lb-ft of torque from the factory regardless of trim level.
1970 Buick GS 455/GSX — $24,995
Streetside Classics (Atlanta, GA — stock 2449-ATL)
The value play of this month’s list by a wide margin. At roughly half the price of the other cars here, expect this one to need a closer look at documentation, originality, and overall condition before you get attached to the number — ask specifically whether it carries GSX-specific parts or just the look.
What the Market Is Telling Us
The $24,995-to-$56,900 spread we found this month tracks almost entirely with documentation and Stage 1 status, not condition alone. The Michigan car at the top of the range earns its price with GS Historical Society paperwork tying it to a specific production number — that kind of third-party verification is worth real money in this market because GSX cloning is a well-known problem. With only 678 genuine GSX cars built and GSX badging, stripes, and the rear spoiler all reproduced and readily available, several enthusiast sources and marque historians note that a disturbing share of cars advertised as GSX on the open market are actually GS 455s dressed to match — which is exactly why two of the five listings we found this month use the hedged “GS 455/GSX” title rather than claiming GSX outright.
A realistic budget for a genuine, well-documented GSX or Stage 1 GS 455 right now starts in the mid-$40,000s for a solid driver and climbs quickly past $90,000 for a numbers-matching, auction-fresh example — the Mecum Indy sale this May at $90,200 is a useful real-world anchor. Below $35,000, you’re generally buying a standard GS 455 or an undocumented GSX-look car, which isn’t a bad thing if you’re after the driving experience and not the investment case, but it changes what you should expect to pay and what you should ask to see in writing.
Supply is tight and getting tighter — the number of genuinely sold GSX and Stage 1 cars we ran into during this research (five, across just a handful of dealer sites) outnumbered the live listings we could verify. A patient buyer chasing a documented example should expect to wait and watch rather than shop on demand; anyone flexible on documentation and willing to buy a GS 455 for what it is has considerably more room to negotiate.
What to Check Before You Buy
The 1970 GS platform shares its A-body structure with the Chevelle and GTO of the same era, and the rust patterns are similar: check the trunk floor at the rear quarter drop-offs, the lower front fenders behind the wheelhouse, the floor pans under the carpet — especially at the front torque boxes near the firewall and the rear seat footwells — and the frame rails and body mount points, particularly around the rear leaf spring perches. GM A-body owners on marque forums consistently flag the cowl area where the windshield meets the hood as another spot that traps water and rusts from the inside out on cars that sat outside for any stretch of their life.
Mechanically, the 455 Stage 1’s Quadrajet carburetor is a common source of drivability complaints on cars that haven’t been properly rebuilt — a worn needle and seat shows up as a rough, rich idle that a lot of casual test drives won’t catch. Buick’s factory Positraction 12-bolt rear end and the TH400 automatic are both generally durable units, but GSX-specific trim — the hood tach, the correct rear spoiler, the A9-package badging — is expensive and slow to source correctly if it’s missing or wrong, and that’s exactly the detail a rushed pre-purchase inspection tends to miss.
Ask for VIN and trim-tag decoding on any car represented as a genuine GSX, and treat GS Historical Society or Buick Club of America documentation as a real factor in the price, not paperwork theater. On a car like this one, where the badge alone can be worth tens of thousands of dollars, verified numbers-matching status is worth paying a premium for if you plan to keep the car — it’s a much harder case to make if you’re planning to flip it quickly and eat the verification cost yourself.
Gear to Bring When You Go Look at It
If any of these listings have you thinking seriously, these are the tools worth having before you go inspect a classic in person — or hire someone who has them.
Muscle Car Fan is not affiliated with any car dealers or listing sites linked in this article and earns no commission on vehicle sales. Links are provided for informational purposes only. Always verify current availability directly with the seller.
Which one on this list would you actually buy — and which would you pass on? If you are in the market for a 1970 Buick GSX right now, what is your number? Drop it in the comments. And if you know of a listing we missed, share the link — the community finds the best ones.
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