The glory of the muscle car only lasted for ten years, from the mid-1960s to the mid-1970s, growing up fast and furiously and a decade later flaming out quickly and ignominiously. The 1970s part of the decade was a time of despair for muscle cars, but the 1960s muscle car shone more brightly than a high-school grad at commencement.Pontiac flourished in the muscle car culture, and names like GTO, Firebird, and Trans Am were born and grew up right before our eyes, becoming part of our auto-vernacular for decades to come. The very mention of their names invokes memories of past glory and visions of current desirability.How we got our model selections: Hot Cars looked at production numbers of 1960s-era Pontiac muscle cars to discover which were produced in the lowest numbers, according to authorities such as Hagerty, Hemmings and Classic.com, as well as Automobile Catalog and GM itself. 1969 Pontiac Firebird Trans Am Ram Air 400 634 Units Produced Mecum Auctions1969 Pontiac Firebird Trans Am Ram Air 400 SpecsIt’s widely acknowledged that the Chevrolet Camaro was rushed into production in 1967 in reaction to the runaway success of the Ford Mustang. The Pontiac Firebird was further rushed, after that, to give Pontiac a pony car. Two years later, the Firebird was taking flight with its Trans Am muscle-car variant.It wasn’t until later on in their lives that Firebird began to share engines with Camaro. Initially, Pontiac and Chevy installed similar engines from their respective divisions, and Pontiac had developed the Ram Air system that aided performance on acceleration runs, mostly early in the run.In the 1969 Trans Am, the Ram Air 400 was the base fitment for the 1969 Trans Am’s 400-cid small-journal Pontiac V8, providing 10 fewer horsepower than the latest Ram Air IV models at the top of the range models. 1969 Pontiac GTO Ram Air 400 Convertible 362 Units Produced Mecum1969 Pontiac GTO Ram Air 400 Convertible SpecsThe Pontiac GTO convertible is one of the rarest cars anywhere, so any version from any model year is going to make any “rarest of” Pontiac list. There are four on this list and three of them are from the 1969 model year. If the ranks were broken down according to transmission, there would be even more.Even though the GTO is all about performance, the GTO convertible enhanced that with a sense of freedom that epitomized the mid- to late-1960s. Both are shining examples of the car culture of the times, but the GTO convertible also heralds a time when things weren’t so hurried and restrictive – a sentiment that is indeed rare these days. 1966 Pontiac GTO XS-Code 389 190 Units Produced Pontiac1966 Pontiac GTO XS-Code 389 SpecsTwo years into its first generation, the Pontiac GTO came into its own in 1966 (it had previously been an option package on the Tempest LeMans). The model benefited from a mid-cycle refresh to the Tempest line and was available in coupe, hardtop, and convertible models.The most notable feature of the 1966 Pontiac GTO XS-Code 389 is the first-ever fresh-air intake that would become Ram Air. Offered as a factory option, the XS-code components were actually installed at the dealership, shipped from the factory in the car’s trunk. Pontiac says 190 XS-code options were ordered, but it’s not known how many were installed.There was more to Ram Air than just cutting a hole under the cosmetic hood-scoop. The system included a new camshaft and valve springs with dampers, which increased valve lift and duration. The power ratings of the XS-coded 389-cid small-journal Pontiac V8 weren’t changed, but there was reportedly a noticeable improvement in acceleration. 1968 Pontiac GTO Ram Air Convertible 114 Units Produced Mecum1968 Pontiac GTO Ram Air Convertible SpecsA new generation of GTO was introduced in 1968, distancing itself from the three-box design of the larger Pontiacs with a fastback-ish profile that harkens back to the streamlined 1940s-era Pontiacs. The GTO was coming onto its own, available in coupe and convertible forms.Although engine choices carried over from the previous generation GTO, the new Ram Air II version included freer breathing heads, a new cam, and a round port exhaust. The changes didn’t impact the official power ratings of the 400- and 455-cid Pontiac V8s, though. 1969 Pontiac GTO Judge Ram Air 103 Units Produced Pontiac1969 Pontiac GTO Judge Ram Air Specs1969 saw the debut of The Judge on the GTO which was redesigned a year previously. The name played on an early rap song and subsequent routine on the then-top-rated Laugh-In comedy sketch show. Its advertisements also played on the comedy routine and general court-related catchphrases.The Judge package included the Ram Air 400 engine system, bare Rally II wheels shod with wider tires and a cosmetic package of a (reportedly functional) rear spoiler and various body decals. A unique T-handled Hurst shifter was also part of the package. The cost was $332 (the equivalent of about $3,000 today). 1969 Pontiac Firebird Trans Am Ram Air IV 55 Units Produced via Bring a Trailer1969 Pontiac Firebird Trans Am Ram Air IV SpecsThe Ram Air IV version of the Trans Am boosted performance from the base Ram Air 400, which is often mislabeled as the Ram Air III to differentiate it from the Ram Air IV (official designation). Both 1969 Trans Ams featured Ram Air, with corresponding boosts in power outputs.The difference in power output between the Ram Air IV and Ram Air 400 is an improvement of 10 hp (same torque). The difference in value today, is astronomical, with Ram Air IV Trans Ams valued from 150% to 250% better than their Ram Air 400 siblings, according to Hagerty. A fair-condition Ram Air IV coupe is valued at $50,000 higher than its concours condition Ram Air 400 equivalent. 1969 Pontiac GTO Ram Air IV Convertible 54 Units Produced Mecum Auctions1969 Pontiac GTO Ram Air IV Convertible SpecsThere were 59 GTO Ram Air IV convertibles produced for the 1969 model year, making it one of the rarest cars ever produced. Of those, five The Judge versions make that variant ultra-rare. Factor in 362 models from higher up in this list, and you see how rare the 1969 GTO convertible is.Yes, the Ram Air IV package makes the 1969 GTO convertible a more powerful machine, but that doesn’t address the persona of the model, which makes it such a desirable model. It has the cachet of the GTO name at the peak of its glory, and the open-air freedom that symbolizes a generation of youth. 1963 Pontiac Catalina Super Duty Lightweight Coupe 14 Units Produced Mecum1963 Pontiac Catalina Super Duty Lightweight Coupe SpecsThe muscle-car era breathed new life into Pontiac’s full-size offerings, as they got smaller and more powerful to make teenagers unashamed to pick up friends in the family car, and unembarrassed at stop-light drag races. The downsized Catalina was Pontiac’s top seller offering convertibles, two-door and four-door sedans, and station wagons.Because of their broad product range, a lot of Pontiac Catalinas were produced in 1963, but only 14 Super Duty Lightweight Coupes. They were affectionately called “Swiss Cheese,” in reference to the 120 holes drilled into the frame’s side rails to earn them the Lightweight designation.Combine that with the Super Duty large-journal Pontiac 421 V8, and the Swiss Cheese Catalina could rip out 12-second quarter miles, according to Automobile Catalog. 1969 Pontiac Firebird Trans Am convertible 8 Units Produced MecumThe Pontiac Firebird pony car had two years under its belt, so it was time to take it up a notch. Production of the first ever 1969 Pontiac Firebird Trans Am totaled 697, with just eight convertibles, which accounts for a good-condition value of $1.1 million today, according to Hagerty.All the new Trans Am variants of the Pontiac Firebird came standard with the Pontiac 400 small-journal V8, which puts out 335 hp in the standard Ram Air 400 configuration. That could be boosted to 345 hp with the optional Ram Air IV mostly for bragging rights, since quarter mile times improved by just 0.2 seconds. 1969 Pontiac GTO Judge Ram Air IV Convertible 5 Units Produced Mecum AuctionsPontiac GTO convertibles are very rare, and none are more so than The Judge edition. Even though breaking down Judge numbers is tricky, according to Hagerty, it is generally believed that only five 1969 Pontiac GTO Judge Ram Air IV convertibles were made, according to Hemmings.Only 769 Pontiac GTOs included the Ram Air IV system, which was an expensive $400 option (over $3,400 today), and just 59 of them were convertibles. In retrospect, it wasn’t a popular option because it didn’t do much in terms of power, boosting horsepower by just four, from the standard Ram Air 400.