Chevrolet LT6-based small-block engine

The Chevrolet Gemini small-block engine is a V8 engine designed by General Motors. While technically a small-block engine due to its bore spacing of 4.4 inches,[1][2] General Motors engineers don't consider it to be a part of the traditional Chevrolet small block lineage, but rather a specialized product.[3][4][5] It is a clean-sheet design, mechanically unrelated to both the LS based engines and the Blackwing V8. With this architecture comes a completely revamped design, departing from the traditional pushrod valves and crossplane crank of the previous generations of Chevrolet small-block engines by featuring dual overhead camshafts and a flat-plane crank. As of March 2022, the Gemini engine has only one variant, dubbed LT6. It is however believed by car journalists that a twin-turbo variant, the LT7, is in the works and would power upcoming ZR1 and Zora versions of the C8 Corvette.[6]

LT6-based small-block engine
Overview
Manufacturer General Motors (Chevrolet)
Also calledGemini
Production2023-
Layout
Configuration90° V-8
Displacement
  • 5,463 cc (333.4 cu in)
Cylinder bore
  • 104.25 mm (4.104 in)
Piston stroke
  • 80 mm (3.1 in)
Block material
Head materialAluminum
ValvetrainDOHC 4 valves
Compression ratio12.5:1
Combustion
Fuel systemDirect fuel injection
ManagementGM E68 (32-bit)
Fuel typeGasoline
Oil systemDry sump
Cooling systemWater-cooled
Chronology
Predecessor

LT6

The LT6 is a 5.5 L; 333.4 cu in (5,463 cc) naturally-aspirated DOHC flat-plane V8 engine. It debuted in the eighth-generation Corvette Z06, and was unveiled on October 26, 2021.[1] It produces 670 hp (500 kW; 679 PS) at 8,400 rpm and 460 lb⋅ft (624 N⋅m) of torque at 6,300 rpm and has a redline of 8,600 rpm, surpassing the 6.2 L Mercedes-Benz SLS AMG Black Series M159 engine, which produces 622 hp (464 kW; 631 PS) at 7,400 rpm, to become the most powerful naturally aspirated production V8 engine.[7][8][1] It is also the biggest production flat plane V8 by displacement, dethroning the Ford Voodoo. This is notable due to the extra vibrations inherent to this architecture compared to a cross plane V8, which tend to scale up with displacement.[9] A modified version of this engine has powered the C8.R since 2019, and many features in the racing engine carry over to the road engine.[2] Other features in this engine include a cast aluminum block, dual coil valve springs supporting titanium intake & sodium filled exhaust valves, forged aluminum pistons, forged titanium connecting rods, active split intake manifold with twin 87mm throttle bodies, four-into-two-into-one stainless steel exhaust headers, and a factory six-stage 10-quart dry sump oiling system with individual crank bay scavenging.[1]

Applications:

Year(s) Model Power Torque Dyno Chart
2023 Chevrolet Corvette Z06 670 hp (500 kW) @ 8400 rpm 460 lb⋅ft (624 N⋅m) @ 6300 rpm

See also

References
  1. ,Steven Rupp (October 26, 2021). "Flat-Plane Crank DOHC LT6 to Power the 2023 Corvette Z06! Details and Specs". motortrend.com. Retrieved October 27, 2021.
  2. "2023 CHEVROLET CORVETTE Z06 ELEVATES THE AMERICAN SUPERCAR". media.chevrolet.com. October 26, 2021. Retrieved October 28, 2021.
  3. Joe Kucinski (February 18, 2022). "LT6 Engine Deep Dive: Everything You Need to Know about the Corvette Z06 Flat-Plane-Crank V8". corvetteforum.com. Retrieved March 5, 2022.
  4. Wren, Wesley (February 18, 2022). "5 Fast Facts About Chevrolet's LT6: The Corvette Z06's Heart". AutoWeek.
  5. Kelly, Iain (October 28, 2021). "The LT6 V8: Inside GM's most powerful small-block". Street Machine. WhichCar.
  6. "GM 5.5 Liter LT7 Twin-Turbo V8 Engine". GM Authority. Retrieved March 11, 2022.
  7. Markus, Frank (October 26, 2021). "How the C8 Corvette Z06's LT6 Became the World's Most Powerful Naturally Aspirated Production V-8". MotorTrend. Archived from the original on October 26, 2021.
  8. Colwell, K.C. (October 26, 2021). "2023 Chevy Corvette Z06 Brings 670 HP of Naturally Aspirated Fury". Car and Driver. Archived from the original on October 26, 2021.
  9. Sommers, Alex (September 7, 2021). "Chevy's eighth-gen Corvette Z06 is poised to topple these 3 production-car V-8 records".
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