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30 Muscle Cars Drivers Avoided That Are Now Worth Millions

Vukasin Herbez December 14, 2020

19. 1971 Ford Mustang Boss 351

In 1971, Mustang received another restyle that would be the final one for the first generation. Once again, the car was bigger in size and weight. Also, it featured a new sharper look with a much wider track. Unfortunately, the Boss 302 and Boss 429 versions were gone. However, the Grande and Mach I stayed, albeit with lower power ratings.

But there was one interesting model introduced in 1971 called the Boss 351. Available for only one year, the ’71 Mustang Boss 351 was one of the rarest Mustangs Ford produced because Ford made only 1,800 of them. It was powered by a highly-tuned version of the 351 V8 engine with around 330 HP. The Boss 351 was fast, good looking, and more expensive than the Mach 1 version of the same model year. Today, it is a truly high-priced collector’s item.

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18. Yenko Camaro 427

The Yenko family started a Chevrolet dealership in Canonsburg, Pennsylvania, in 1949. In the late â€˜50s, when Don Yenko managed the business, the company turned to the performance car market. They started with a series of race-prepared Corvettes Don raced himself and then moved to full conversion jobs based on various Chevrolet models.

With the Camaro’s introduction in 1967, Yenko started converting it to 427 V8 power, selling them as Yenko Super Cars. In addition to more power, wild graphics, and a long list of options, Yenko even offered a factory warranty, heavily promoting his models. That’s why those Yenko Camaros were the most popular choice in a custom 427 V8 conversion on the regular SS. But they only produced those 427 Camaros for just a few years. The total production number was around 600 with just a handful left.

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17. Buick GSX

The GSX debuted in 1970 with an aggressive graphics package that was unusual for Buicks. Also, it was available in two bright colors, Saturn Yellow and Apollo White. The GSX came with a front and rear spoiler, functioning hood scoops, side stripes, and Rally wheels. The power output was the same at 345 HP/510 lb-ft. However, because the Buick 455 was significantly lighter than the Chevelle 454 and the Plymouth Hemi 426, the GSX was a winner in street races across America.

Despite the qualities of the GSX and numerous accolades from the motoring press, Buick built less than 700 of them. The GSX package added $1,100 over the price of a regular GS 455. So the price tag proved to be too expensive for most buyers. Although the GSX option was available in 1971 and 1972, they produced those models in even smaller numbers.

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16. 1970 Shelby GT 500

By the early â€˜70s, Ford had numerous performance versions of the Mustang and Shelby models, but they became outdated. So their cars’ demand was not as much as before and production numbers were even smaller.

However, the 1970 Shelby GT500 was still a fabulous classic muscle car that came as coupe and convertible. Under the hood was the 428 V8 engine, which they conservatively rated at 335 HP. But it really produced more than 400 real-life horsepower. In the end, Ford only built 789 1970 models.

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15. 1971 Plymouth GTX 426 Hemi

The GTX was a gentleman’s hot rod with all the top options including nice interior and exterior details. But it only had one optional engine choice, the mighty 426 Hemi. The 440 Magnum was the standard engine, yet if you wanted the ultimate Plymouth muscle luxury, you had to go for the Hemi. However, because it was significantly more expensive than the rest of the Mopar muscle car lineup, the GTX wasn’t popular, so it is very rare today.

In the early â€˜70s, when all muscle cars started to lose power and torque figures, Plymouth discontinued the GTX. So in 1971, they ceased production to keep it from being a disgrace to its fire-breathing predecessors. And that’s why the â€˜71 GTX is the last of its breed as well as a fantastic muscle car.

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14. Ford Fairlane 427

Ford wanted to beat Mopar in drag racing, so they needed a proper weapon for the Super Stock class. It had to be something that was compact and light but big enough to accommodate the large R Code 427 V8 engine. Ford found their solution in the Fairlane lineup of cars. In 1967, Ford debuted the specially-prepared 427 Fairlane.

It looked stock from the outside but hid lots of secrets. The main feature was the highly-tuned 427 V8 engine rated at 425 HP. It also came with lightweight body parts and a performance drivetrain. Although the Fairlane 427 proved to be successful on the track, Ford built only 57 of them. Today, it is a highly sought-after piece of muscle car history.

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13. Chevrolet Chevelle Z16

You may be wondering exactly what the Chevelle Z16 is. Basically, it’s a fully-loaded regular Chevelle with all the necessary options. They include a 396 V8 engine with a Muncie four-speed gearbox and a heavy-duty suspension and equipment.

Yet even some Chevy dealers weren’t aware this option existed. In fact, Chevrolet refused to market the Z16 for some reason. That made this Chevelle kind of a secret model. The Z16 was fast, but it was also expensive for a Chevrolet, so they made only 200 of them.

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12. Mercury Marauder X-100

The Marauder was a car they imagined as a luxury coupe and had a fresh design with some interesting features. Mercury included concealed headlights and a massive front end. Also, it had a sloping rear end with concave rear glass. The Marauder was a big, heavy car intended for cruising rather than street racing. However, Mercury needed something to fight the Pontiac Grand Prix and Buick Riviera GS. They knew they needed to upgrade the Marauder to higher specs.

So they introduced the Marauder X100. Behind the strange name was a regular 1969 Marauder with a 429 V8 engine with 360 HP. Also, it had bucket seats, a heavy-duty suspension and blackout rear trim, and fender skirts. The performance was respectable, but it was still a big, heavy car, so compared to some barebones smaller and lighter muscle models, it was significantly slower. The Marauder line was relatively popular, but the X100 wasn’t a best-seller. In its two years of production, Mercury made just over 8,000 of them.

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11. Shelby GT350 R

As you already know, Carroll Shelby started building Mustangs in 1965 as fire-breathing machines. He brought Ford some much-needed recognition and performance credentials. The cars responsible for his racing success were those 34 “R” models Ford produced only in 1965. Ford sold them to privateers and racing teams all over America and the world. But those cars were not street legal and were purely for racing purposes, something that they did extremely well. The GT350 R underwent numerous modifications, so it was lighter, faster, and sharper than the regular GT350.

However, the R version was powered by the same 289 V8 as the regular Shelby GT350, yet it produced close to 400 HP. The car was light and well-balanced, winning races in America, Europe, and South America. Because each GT350 had so many wins under its belt, every R model is considered to be a precious piece of Mustang history.

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10. 1974 Pontiac Firebird Trans Am SD 455

By 1974, almost all muscle cars were extinct from the market. Those that remained lacked both power and style. However, one model managed to survive and offer as much of both as possible. That model was the 1974 Trans Am Super Duty 455. The year marked the first restyling of the whole Firebird range with a new front and rear end and improved interior and details. The SD 455 model carried over from 1973 but featured an updated suspension and brakes in a new package.

The standard 455 V8 had only 215 HP and 290 HP in SD trim, fantastic for 1974. In fact, with 290 HP, a host of performance upgrades, and a four-speed manual transmission, the 1974 Trans Am SD 455 was faster than the Corvette. This made it the fastest American production car of the period.

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9. Oldsmobile Rally 350

To fight the tightening regulations that were destroying muscle cars, Oldsmobile introduced the bright yellow Rally 350. It was smart to avoid high insurance premiums with a smaller yet still powerful 350 V8 engine producing 310 HP. This model was basically a 442 muscle car with a smaller engine and price. The bright yellow paint was the most exciting feature, along with yellow bumpers, spoiler, and wheel inserts.

It looked like somebody dropped the Oldsmobile Cutlass in bright yellow paint. Other manufacturers introduced similar models, but this Oldsmobile stands out due to its unmistakable appearance. However, the Rally 350 wasn’t a big success despite its intelligent engineering, so Oldsmobile only built 3,547 of them in 1970. Although most Oldsmobile performance cars are well-known among car enthusiasts, they forgot the Rally 350, so it’s very rare today.

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8. Dodge Charger 500

Most muscle car fans know the Dodge Charger lineup well, including the Charger Daytona from 1969. But the Daytona’s predecessor, the Charger 500, was far less-known and not as successful. In the late ’60s, Dodge was desperate to race at NASCAR, and the Charger was the perfect candidate. However, since NASCAR cars approached high speeds of almost 200 mph on newly-constructed superspeedway tracks, aerodynamics played a role in its performance. The standard Charger with its deep grille and concave rear glass wasn’t aerodynamic. So despite its powerful engines and skilled drivers, it couldn’t achieve the speeds required for winning.

Dodge decided to introduce their limited-edition Charger 500. They named the 500 because they only made that many of them. It came with a flushed grille, fixed headlights, and regular rear glass to improve the aerodynamics of the car. But then Dodge decided to go even further and presented the Daytona. The Daytona 500 came with two engines, a standard 440 and an optional 426 Hemi. Since the Daytona was more successful and interesting, everyone soon forgot about the Charger 500 except for hardcore Mopar fans.

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7. Pontiac GT-37

One of the rarest and most forgotten muscle cars is the Pontiac GT-37. It wasn’t a model of its own but an option package on the 1970 and 1971 Tempest. The inspiration for this model came from Plymouth. In 1968, Plymouth introduced the Roadrunner, a budget-friendly, bare-bones muscle car with wild graphics and few options. Pontiac intended the vehicle to be for younger buyers with limited budgets yet a need for performance. The Roadrunner proved to be a strong seller. Soon, all car companies started thinking about inexpensive models to attract younger customers. But for some reason, Pontiac waited until 1970 to introduce such a model in the form of the GT-37.

Behind this strange name was a regular Tempest with a few more performance options and an engine from the more popular GTO model. This meant buyers who had $3,000 to spend could get a car from 255 HP all the way to 345 HP. Pontiac advertised the GT-37 as the “GTO Lite,” but the car lacked exterior features like the famous Endura bumper and rear spoiler. For 1971, they offered the famous 455 V8, but it only went in a handful of cars. Simply put, the GT-37 had the performance and the hardware but it lacked the GTO’s appeal, resulting in bad sales. In two years, Pontiac made only around 2,000 of these misunderstood muscle cars. Today, the GT-37 is a rare sight.

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6. AMC Marlin 343

Back in the mid-1960s, AMC was famous for its lineup of economy cars and small sedans. This was before the AMC Javelin and AMX entered the mainstream muscle car class. However, AMC company management wanted an exciting, sporty car, so they turned to their Marlin model. As a result, the Marlin was a mid-size fastback with a design suggesting it was fast and powerful. The truth was the car only delivered mediocre performance. But for the 1967 model year, AMC decided to introduce a 343 V8 version of the Marlin with 280 HP on tap.

Despite the fact it wasn’t a lot, it was still enough to provide the Marlin with decent performance and driving dynamics. Today, 343 V8-powered Marlins are rare, but there are even rarer versions. Some had a factory-tuned 343 V8 engine that produced 320 HP, giving the Marlin real power. While it’s unclear how many of those special-order cars they made today, they are nearly impossible to find.

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5. Studebaker Avanti R2

In the early ’60s, Studebaker management decided to invest in a luxury coupe to fight their poor sales. They thought a new, fancy upscale model would attract more customers to Studebaker. In 1962, they presented the sleek, modern-looking Avanti. The innovative design, construction, and technology were impressive, and the car received praise from the motoring press. But the base version wasn’t powerful, so Studebaker introduced its supercharged R2 option delivering 289 HP. The R2 version didn’t come with an automatic transmission or air conditioning. In fact, it only came with a close-ratio manual gearbox. However, they included some performance upgrades, turning the Avanti into a fast machine.

Incredibly, the R2 broke 28 world speed records by achieving top speeds of 170 mph, a big deal in 1963. The R2 could sprint from 0 to 60 mph in just 7.3 seconds. Unfortunately, Studebaker had problems with production, so the Avanti was limited in availability, affecting its popularity. Sadly, by 1964 they discontinued this model. Today, most car enthusiasts recognize the Avanti R2 as one of the coolest ’60s cars as well as an early luxury muscle car. During its short production run, Studebaker produced just over 4,600 Avantis and only a handful were R2s.

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4. Chevrolet Chevelle “Heavy Chevy”

In 1971, dark clouds were on the horizon for muscle car enthusiasts. Tightening government regulations, high insurance rates, and environmental standards attacked the segment. Manufacturers understood they had to act fast to save the market. So the first thing they did was introduce economy versions of their popular muscle cars. They gave their cars smaller engines but interesting designs to maintain appearance and popularity. One of those models is the 1971 Chevelle “Heavy Chevy.”

It was an interesting one-year-only muscle car positioned below the Chevelle SS lineup. The Heavy Chevy came with a 200 HP 307 CID V8 engine, and you could also opt for a 245 HP 350 CID V8 engine. The most powerful version was the 300 HP 402 CID V8. If you wanted a top-of-the-line 454 big-block V8, you had to go the SS route. Although the Heavy Chevy was a popular model and they built over 6,500 of them in one year, it’s quite rare today.

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3. Pontiac Can-Am

Back in the late ’70s, the American performance car segment was a shadow of its former glory. Tight ecological and safety standards killed those high compression engines and ruined performance. Although there were a few surviving models, “performance” was just a word people used in magazine ads. But in 1977, everything changed when Pontiac introduced the Can-Am. The Can-Am was a one-year-only model and the last real muscle car. It had big-block power packed into its unique body style. Under the hood scoop sourced from the Firebird Trans Am, a big 455 engine was delivering 200 HP. That was more than any other muscle car on the market at the moment.

The Can-Am package consisted of special rear window louvers, rear spoilers, and optional extras. Pontiac introduced the Can-Am in early 1977 and the market responded well. Pontiac received between 5,000 and 10,000 reservations but only sold 1,377 of them. The problem was that the outside contractor that assembled the Can-Am suffered equipment failure. They had to wait three months for the new equipment, but Pontiac couldn’t wait, so they canceled all orders. This killed the Can-Am, and they didn’t offer this model again until 1978.

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2. Mercury Cougar Boss 302

They conceived the Mercury Cougar as a luxury pony car, building it on a stretched Mustang platform. This meant all the engines they installed in the Mustang could easily fit into the Cougar as well.

In 1969, Ford introduced the Boss 302, and Mercury got its own version too. They called it the Cougar Boss 302. Strangely, Ford didn’t widely advertise this highly-capable pony car, so it remained obscure. Mercury produced just 169 of them, and it’s a mystery how many have survived to this day.

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1. 1969 Plymouth Barracuda 440

The biggest news for 1969 was the introduction of the Barracuda 440 V8. It was a monster pony car with the biggest engine ever installed under the hood of a car in that segment. The Barracuda 440 produced 375 HP and a massive 480 lb-ft of torque. This made it fast but also hard to launch due to loads of wheel spin.

Due to the engine’s tight fit, there wasn’t enough space for a power steering pump. That meant Barracuda 440 owners had to use their muscles to turn this compact but overly powerful car. Plymouth only made a handful of these models, which makes them very rare today.

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30 Muscle Cars Drivers Avoided That Are Now Worth Millions

19. 1971 Ford Mustang Boss 351

18. Yenko Camaro 427

17. Buick GSX

16. 1970 Shelby GT 500

15. 1971 Plymouth GTX 426 Hemi

14. Ford Fairlane 427

13. Chevrolet Chevelle Z16

12. Mercury Marauder X-100

11. Shelby GT350 R

10. 1974 Pontiac Firebird Trans Am SD 455

9. Oldsmobile Rally 350

8. Dodge Charger 500

7. Pontiac GT-37

6. AMC Marlin 343

5. Studebaker Avanti R2

4. Chevrolet Chevelle “Heavy Chevy”

3. Pontiac Can-Am

2. Mercury Cougar Boss 302

1. 1969 Plymouth Barracuda 440

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