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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 October 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]

Gemini small-block engine
Overview
Manufacturer	General Motors (Chevrolet)
Production	2022-present
Layout
Configuration	90° V8
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	Sand-cast A319 Aluminum
Head material	Aluminum
Valvetrain	DOHC 4 valves
Compression ratio	12.5:1
RPM range
Redline	8,600 RPM (soft), 9,000 RPM (hard)
Combustion
Fuel system	Direct fuel injection
Management	GM E68 (32-bit)
Fuel type	Gasoline
Oil system	Dry sump
Cooling system	Water-cooled

LT6

The LT6 is a 5.5 L; 333.4 cu in (5,463 cc) naturally-aspirated 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 largest production flat-plane V8 by displacement, dethroning the Ford Voodoo. This is notable due to the additional vibrations inherent to this architecture compared to a crossplane 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	link

See also

• Chevrolet small-block engine
• General Motors LS-based small-block engine
• List of GM engines

References

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