Picture this: you're cruising through a classic car auction and spot a Pontiac that makes seasoned collectors stop dead in their tracks. We're talking about a machine so rare that finding one is like discovering buried treasure in your grandfather's garage. The 1970s marked the twilight of America's muscle car golden age, and Pontiac created something truly special during those final glory years. What we're about to reveal will surprise even die-hard Pontiac enthusiasts.Detroit's automakers were throwing everything at the wall during the 1970s, desperate to keep the performance dream alive as emissions regulations tightened their grip. General Motors had multiple brands competing for attention, but Pontiac stood out as the company's performance flagship. While most people know about the GTO and Trans Am, there's one particular Pontiac that barely made it off the assembly line. This forgotten beast represents not just automotive rarity, but a fascinating glimpse into what might have been if the muscle car era had continued unchecked.This article was written based on information provided to HotCars by Mecum, Barrett-Jackson, General Motors, and Hagerty. Some performance specifications and production numbers are estimates based on data gathered from these sources. The 1970 GTO Judge Ram Air IV Convertible Is The Rarest 1970s Pontiac Muscle Car Barrett-JacksonPontiac built tens of thousands of GTOs for the 1971 model year, but the Judge Ram Air IV Convertible is exceedingly rare. Beyond its Ram Air IV engine, which was the last of its kind to make it into a production car, Pontiac only built 17 of the cars, giving them the aggressive bodywork and sporty stance of the hardtop with the excitement of open-air driving. Overview of the 1970 Pontiac GTO Judge Convertible Barrett-Jackson The 400 cubic-inch V8 made 370 hp when new. A three-speed auto or four-speed manual transmission options were available. Pontiac only built 17 of these Ram Air IV-equipped GTO Judge Convertibles for the 1970 model year. 1970 Pontiac GTO Judge Ram Air IV Performance Barrett-Jackson 1970 Pontiac GTO Judge Ram Air IV Convertible Engine Specs The Pontiac Ram Air IV engine is a legendary mill that produces a great deal of power and torque. Its innovative intake system pulls cool air from the car's exterior through a hood scoop, and the engine's design allowed it to rev to 6,000 rpm, a very strong number for the time.Adding to the GTO's appeal, the Ram Air IV was the last in the engine series to make it into a production car. Pontiac designed and built Ram Air V engines, but never used one in a factory-built car. That said, some dealers and enthusiasts installed the Ram Air V after the fact.Barrett-JacksonBeyond the GTO Contertible's rarity, its Ram Air IV engine plays a significant role in driving its value. Many enthusiasts view the mill as the high water mark for Pontiac-built 400 cubic-inch engines, and its unique intake system, performance, and sound make it one of the most desirable engines in GM's long history.The 1970 GTO Judge's Ram Air IV engine made it a real screamer for the time. A low-five-second 0-60 mph time is competitive with many hot hatchbacks and performance cars today, so it was a formidable performance machine in the early 1970s. That said, the car's upgraded suspension and beefy radial tires did not make it a nimble handler, a common issue for American muscle cars of the era.Barrett-JacksonStraight-line speed, quarter-mile times, and smoky burnouts were the GTO's specialty, and the convertible model makes for an excellent open-air cruiser. The Ram Air's sound is even more dramatic with the top down, and the 'verts unique styling makes the GTO's already bold styling even more eye-catching. 1970 Pontiac GTO Judge Ram Air IV Convertible Values And Sales Data Mecum Because there are only 17 of the Ram Air IV Convertibles, values are extremely difficult to nail down. Additionally, there is no concrete data on how many cars remain or what condition they are in. There have been a handful of auctions over the last decade, but prices are all over the map.Mecum auctioned one in 2023 for $405,000, while earlier that year, an Orbit Orange convertible crossed the auction block with a final bid of $1.1 million. That said, there are several GTO variants, so it's important to note that you'll likely see values far below those numbers.Models equipped with the Ram Air III engine and variants from other model years may look similar, but they are nowhere near as rare or valuable as the Ram Air IV-equipped Convertibles, which are among the priciest muscle cars of their time. Even the low end of those auction results dwarf the values of the Ram Air III GTO Judge Convertible - a desirable configuration itself. GTO Judge Ram Air Values Sources: Hagerty, Mecum AuctionsThe value of cars like these rare Pontiacs is dependent on a range of factors that can make owning and driving them a real pain. Cosmetic condition is a big deal, and every scratch, dent, and ding can make a significant impact on the value. Mileage and mechanical condition also matter, which can make driving the GTO Judge Convertible a stressful experience.Because there were so few of these GTOs built and likely fewer remaining on the road, replacement parts are sometimes impossible to find. Even with the right parts, repairing rare cars like the GTO can make a dent in the resale value."Numbers-matching" is a term used to describe a car whose engine, chassis, and other components carry the same VIN. Replacing significant parts such as the transmission or engine block often hits the car's value, even if it was a necessary repair. Final Thoughts On the 1970 GTO Judge Ram Air IV Convertible Mecum Calling a car "the end of an era" is an overused phrase, but the 1970 Pontiac GTO Judge Ram Air IV Convertible is one of the few that actually embody the phrase. Pontiac stopped the Ram Air program after the fourth iteration, moving to other V8s after that.Additionally, tightening fuel economy and emissions regulations in the U.S. made it difficult to generate the same performance and output from subsequent engines, so the Ram Air-equipped GTOs actually do represent the end of the road for Pontiac's most iconic engines. Despite the cool factor, it's hard to imagine buying and enjoying such a rare car.How many burnouts and hammer-down runs can someone do before they start worrying about diminishing the car's value? There are so many other cars from the period that offer similar performance and much more reasonable price tags that the GTO Judge Convertible feels like it should be a museum piece instead of a regularly driven vehicle. Other Exciting 1970s Muscle Cars For Less If your heart is set on a GTO, you can get behind the wheel for much less than $100,000. There are several cars available on Hemmings right now, including a few 1970 hardtops for around $60,000, and even some convertibles fall at or below that mark.The Chevrolet Camaro, Ford Mustang, Dodge Charger, and many others are similarly priced and deliver comparable performance to the Pontiac. They're far less precious than the ultra-rare GTO Convertible, too, making them ideal for people who want a powerful muscle car they can actually drive.