As one of the biggest and most recognizable automotive brands in the world, Chevrolet has created some amazing cars. Several of them have been ones that had extremely limited production runs. Creating special, limited-run variants of existing cars isn't just limited to Chevrolet (or the General Motors brands in general). However, those special Chevrolets tend to get a lot of attention from enthusiasts. Those limited-run Chevys include one that's so rare and so special, collectors still actively search for it. Chevrolet Has Produced Several Ultra-Rare Special Models Via: Bring A TrailerLike quite a few major manufacturers, Chevrolet has produced several ultra-rare special models over the years. Some of these were just slightly more special versions of regular sports cars or muscle cars Chevrolet made. Others, however, were a little bit more crazy (we'll get into that in just a bit...). These special models were typically only produced for one model year, or a few model years. Sometimes, they'd also come back in later generations of the car they were based on. Whatever the case, Chevy seems to be one of those automakers that keeps on producing special cars that only hang around for a brief moment in time. The Golden Age Of The American Car Industry Birthed Some Of The Craziest Chevys Ever MecumA lot of these special Chevrolets were produced during that mid-'60s to early-'70s period. This was the real golden age of the American car industry before the oil crisis and tightening emissions regulations started ruining things. As a result, some of these special models were absolutely crazy. Several were created as a result of homologation rules that applied to the top American racing series at the time. This included the original Camaro Z/28, which was created as a homologation special for the Trans-Am series. Other times, they were created by entrepreneurial dealers using the COPO system to its full potential. That COPO system created drag strip monsters like the Chevrolet Camaro ZL1 and the various Yenko specials.Those special, crazy Chevrolets also included a couple of Corvette variants. One of those has become an ultra-rare performance monster that collectors really want. Although it may not get as much attention as the homologation specials or COPO specials, it's still one of the coolest limited-run cars to have come out of Detroit during this golden era. The 1971 Chevrolet Corvette ZR2 Is An Ultra-Rare Car That Collectors Still Desperately Want MecumFrom the outside, the 1971 Chevrolet Corvette ZR2 might look like a fairly normal C3 Corvette. However, it's anything but ordinary under the hood. That's where you'll find a massive 454 cubic inch V8, producing 425 horsepower (as rated by the factory) and 475 pound-feet of torque. That power alone gives it proper performance monster capabilities for the early 1970s. However, Chevrolet did more than that to make the ZR2 terrifyingly fast. As part of turning a regular C3 into a ZR2, Chevrolet took out everything that wasn't essential to making the car as light and fast as possible. This included removing the radio, and various features that were luxuries at the time (such as power steering). The ZR2 also got heavy-duty suspension and dual-pin front disc brakes, helping it to handle that big-block power better. It Shares Some DNA With Other Crazy Chevys Via: Mecum AuctionWhile the ZR2 is an incredibly special car, it's not 100% unique. It does share components with other crazy special Chevys. One of those major components it shares with other special cars is that 454 cubic inch V8. This is the LS6 engine, the same one used in the Chevrolet Chevelle SS 454 LS6. The LS6-equipped Chevelles have gained notoriety for how they were terrifyingly fast gentleman's muscle cars in their heyday. It's not surprising, then, that the Corvette ZR2 got a reputation like that in its own right.The 4-speed manual transmission is also something it shares with other special Chevrolet models. It's the Muncie M22 "Rock Crusher" transmission, a racy close-ratio unit that could handle huge amounts of torque. It was often used in other big-block variants of the Corvette, as well as big-block Camaros and Chevelles. Only Twelve Of Them Were Ever Made Via: Mecum AuctionThe Corvette ZR2 was a one year only special. It was also a very niche car that only the most hardcore Corvette customers would want to order. As a result, barely any of them were made. Only 12 are known to have ever been built—10 coupes and 2 convertibles. Out of that number, only 7 have been confirmed to still exist. That makes it one of the rarest Corvette variants of all time, and one of the rarest Chevrolets in general. The only other Corvette that can really beat it in terms of rarity value is the 1969 Corvette ZL1. Only two of those were ever made, and they have the same engine as the original 1969 Camaro ZL1. It's One Of The Most Valuable Chevys In The World Via: Mecum AuctionAs you'd expect for how rare the Corvette ZR2 is, it's become one of the most valuable Chevrolets in existence. ZR2s very rarely come up for auction. When they do, expect to see them sell for eye-wateringly high prices! It's very common for ZR2s to sell for over $200,000 or $300,000. The latest example to sell at auction sold for $650,000 in 2023, at Mecum's auction in Indianapolis. 9 years before, the same car had sold for $495,000 at a Barrett-Jackson sale in Scottsdale, Arizona. Judging by that one example alone, it's likely not long until the 1971 Corvette ZR2 becomes a million-dollar car.Sources: Barrett-Jackson, Chevrolet, Classic.com, Mecum Auctions