| 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) |
| Cylinder block material | Sand-cast A319 Aluminum |
| Cylinder head material | Aluminum |
| Valvetrain | DOHC 4 valves |
| Compression ratio |
|
| RPM range | |
| Max. engine speed | 8,600 RPM (soft), 9,000 RPM (hard) |
| Combustion | |
| Turbocharger | Twin-turbo (LT7) |
| Fuel system |
|
| Management | GM E68 (32-bit) |
| Fuel type | Gasoline |
| Oil system | Dry sump |
| Cooling system | Water-cooled |
The Chevrolet Gemini small-block engine is a dual-overhead cam (DOHC) V8 engine designed by General Motors. While technically a small-block engine because of its bore spacing of 4.4 inches,[1][2] General Motors engineers do not consider it to be a part of the traditional Chevrolet small block lineage because of the substantial reworking, specialized development, and unique technical features distinguishing its design.[3][4][5]
The Gemini is a clean-sheet design, mechanically unrelated to both the LS-based engines and the Cadillac Blackwing V8. Its most notable traits include a flat-plane crankshaft and dual-overhead camshafts, which represents a departure from the traditional pushrod valves and crossplane crankshafts found in all previous generations of Chevrolet small-block engines. As of July 2024, the Gemini engine has two variants, dubbed LT6 and LT7.[6]
- ^ 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.
- ^ "2023 CHEVROLET CORVETTE Z06 ELEVATES THE AMERICAN SUPERCAR". media.chevrolet.com. October 26, 2021. Retrieved October 28, 2021.
- ^ 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.
- ^ Wren, Wesley (February 18, 2022). "5 Fast Facts About Chevrolet's LT6: The Corvette Z06's Heart". AutoWeek.
- ^ Kelly, Iain (October 28, 2021). "The LT6 V8: Inside GM's most powerful small-block". Street Machine. WhichCar.
- ^ Tingwall, Eric (July 25, 2024). "Monster! The Story of the Corvette ZR1's LT7 V-8 Engine and How It Makes 1,000+HP". MotorTrend.