One of the things that Chevrolet is best known for is being an engine builder. Chevrolet's engines have been used all over the world, and by a variety of different automakers. Chevrolet does often save the best engines for itself, though. One of those is an engine that can legitimately challenge some of the best high-performance engines from outside North America. Chevrolet Has A History Of Making Brilliant V8 Engines Via: Mecum AuctionsOver the years, Chevrolet has become synonymous with making great V8 engines. They often end up being powerful, reliable workhorses that can power all sorts of different vehicles. Many of those have included sports cars and muscle cars. They've also varied a lot in size and design. Most people will know about the original Chevy small-block V8 and the more modern equivalents from the LS family. But, there are some more weird and wonderful V8s that Chevrolet has put into its cars over the years. One of the weirdest, most wonderful, and most awesome of them was placed into a variant of Chevrolet's greatest sports car. Many Of Those Great V8s Have Been Put In The Corvette MecumThere's probably no car that's more synonymous with how great the Chevrolet V8 can be than the Chevrolet Corvette. Every single generation of the Corvette has used various Chevy V8s. These have ranged from the original Chevy small-block, all the way up to the big-block monsters of the '60s and '70s, and the turbocharged and supercharged fire-breathers we've seen in more recent times. One of those high-performance fire-breathers that's been used in the Corvette in more recent times is perhaps the single-craziest engine family that General Motors has ever come up with. While it may be an all-American V8, its performance is more like that of a thoroughbred European engine. It revs almost to the stratosphere, and it provided the basis for the powertrain of the most powerful Corvette of all time. The Chevrolet LT6 "Gemini" V8 From The C8 Corvette Z06 Is A Flat-Plane Monster That Loves To Rev ChevroletThe power plant of the C8 Chevrolet Corvette Z06, the Gemini is unlike any V8 Chevrolet has ever made before. Instead of achieving its massive power through displacement, Chevrolet went a different route. It decided to go for a flat-plane crank design. A flat-plane crank is called that because the crank pin journals are arranged 180 degrees apart from each other. This makes the crank have a flat "I" shape. It's typically found in inline-four engines — the Gemini LT6 is a rare example of it being in a V8. When a flat-plane crank is used in a V8, it creates a more even firing order than in a typical V8. The firing order acts like two inline-4 engines joined together, alternating between cylinders on the left and right banks perfectly evenly.That flat-plane crank design not only makes it an incredibly powerful engine, but also one that absolutely loves to rev. It's easily the highest-revving production American V8 in recent years, topping out at 8,600 rpm. That's near-superbike levels of revs, from a kind of engine you'd associate more with lower-revving muscle cars! It's A Clean Sheet Design That's Completely Unique From Other General Motors V8s One of the single most impressive things about the Gemini V8 is that it was a total clean-sheet design. It shares absolutely nothing in common with Chevrolet's regular LS-line of V8 engines, or the twin-turbocharged Blackwing V8. While this meant it needed the extra effort of being developed completely from scratch, the trade-off is that it's the perfect engine for what Chevrolet wanted out of the Corvette Z06. Chevy clearly wanted an engine that was more like a higher-revving European V8, able to match the lower end of European supercars in terms of power. That's exactly what the Gemini gave the Corvette range. It's One Of The Most Powerful Naturally Aspirated V8s Of All Time Via: ChevroletThe LT6's 670 horsepower and 460 pound-feet of torque may not seem that impressive if you compare it to a lot of today's incredibly powerful supercars. But, those supercars have to use forced induction to get to that kind of power. The Gemini LT6 produces all of its power without needing turbochargers or superchargers at all. That makes it one of the most powerful naturally aspirated V8s ever made. It's much more powerful than the last super-powerful naturally aspirated V8 GM made (the 7-liter LS7 V8 found in the C6 Corvette Z06), and it's also more powerful than the 6.2-liter M159 V8 used in the Mercedes-Benz SLS AMG Black Series. A Modified Version Of It Is Used In The Race Version Of The Corvette As you'd expect from such a racy engine, the Gemini LT6 isn't just for road cars. It was actually first developed to power the Corvette C8.R race car, which has been an incredibly competitive force in sports car racing since 2020. Originally built to the LMGTE specification, it was later adapted for GT3 rules (being renamed the Z06 GT3.R in the process) following the switch to those regulations in the World Endurance Championship and the IMSA Sports Car Championship.Corvette race cars have tended to be among the most successful in GT classes, and the C8.R and Z06 GT3.R both continued that record on. The C8.R got 18 class wins in the IMSA Sports Car Championship from 2020-2023, and the Z06 GT3.R has currently achieved 3 class wins in that same championship from 2024 onwards. The Twin-Turbocharged LT7 Was Developed In Tandem With The LT6 Via: ChevroletIf the name "Gemini" hadn't already given it away, the LT6 isn't the only Chevrolet V8 that uses the racy flat-plane crank design. The twin-turbocharged LT7 V8 that powers the Chevrolet Corvette ZR1 and makes up part of the hybrid powertrain of the Chevrolet Corvette ZR1X was developed at the same time as the LT6. It shares the same architecture, too. The only big difference between the LT6 and the LT7 is the twin turbochargers, which boost the LT7 to 1,064 horsepower and 828 lb-ft of torque. Combined with the hybrid system derived from the Corvette E-Ray in the ZR1X, that power goes up to an astonishing 1,250 horsepower. That makes the ZR1X the most powerful Corvette ever produced, and the fastest American-built street-legal car ever.Sources: Chevrolet, IMSA, Mercedes-Benz
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