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GM 5.5 Liter LT6 V8 Engine
The LT6 is a 5.5-liter, eight-cylinder, dual-overhead cam engine from General Motors that made its debut in the 2023 Chevrolet Corvette Z06.
Displacement: | 6.2L / 333.3 cu. in. |
Aspiration: | Natural |
Vehicles: | Corvette C8 Z06 |
Introduced: | 2023 model year |
Discontinued: | - |
Predecessor: | - |
Successor: | - |
Assembly: | Bowling Green, Kentucky |
Overview
The GM LT6 engine is naturally-aspirated, displacing 5.5 liters in a V-8, Dual Overhead Cam (DOHC) configuration with a flat-plane crankshaft which allows it to rev to a sky-high 8,600 redline.
Specifications
Type: | LT6 5.5L V8 VVT |
---|---|
Bore x stroke (in / mm): | 4.104 x 3.150 / 104.25 x 80 |
Block Material: | A319-T7 sand-cast aluminum with pressed-in iron cylinder liners and four-bolt main bearing caps |
Oiling System: | Dry sump (8-qt. capacity); includes oil-spray piston cooling |
Oil Type: | Dexos R 5W50 synthetic |
Cylinder Head Material: | A356-T6 cast aluminum |
Combustion Chamber volume: | 58.8cc |
Compression Ratio: | 12.5:1 |
Valvetrain: | Dual overhead camshafts with mechanical finger follower valvetrain and dual-coil valve springs |
Valve Size (in / mm): | 1.654 / 42 titanium (intake) & 1.378 / 35 sodium filled (exhaust) |
Fuel Delivery: | Exhaust side direct injection; Max pressure: 5,076 psi (35 Mpa / 350 bar) |
Firing Order: | 1-4-3-8-7-6-5-2 |
Throttle body: | 87mm single bore (electronic) |
ECU: | GM E68 (32-bit processing) |
Vehicle Applications
The GM LT6 engine will serve as the standard powerplant for the mid-engine Chevrolet Corvette C8 Z06. The track-focused mid-engine super car is expected to launch for the 2022 model year.
Model Year | Make | Model | Power (hp/kW @ RPM) | Torque (lb-ft/Nm @ RPM) | Transmission |
---|---|---|---|---|---|
2023 | Chevrolet | Corvette C8 Z06 | 670 / 500 @ 8,400 | 460 / 623 @ 6,300 | 8-Speed Dual-Clutch |
Related Engines
Despite its LT designation, the LT6 will have nothing in common with GM’s fifth-generation Small Block overhead valve (push-rod / OHV) engine family, which includes the following motors:
- 6.2L V-8 LT1 naturally-aspirated
- 6.2L V-8 LT4 supercharged
- 6.2L V-8 LT5 supercharged
- EcoTec3 family:
- 6.2L V-8 L87 naturally-aspirated
- 6.2L V-8 L86 naturally-aspirated
- 5.3L V-8 L84 naturally-aspirated
- 5.3L V-8 L83 naturally-aspirated
- 5.3L V-8 L82 naturally-aspirated
- 4.3L V-6 LV3 naturally-aspirated
- 4.3L V-6 LV1 naturally-aspirated
- 6.6L V-8 L8T naturally-aspirated
Instead, the LT7 engine represents an all-new, sixth-generation DOHC V8 engine family that’s derived from the 4.2L Cadillac Blackwing engine (RPO Code LTA) and the LT7, a twin-turbocharged version of the LT6 that will be used in the C8 ZR1 and C8 Zora.
Pictures
LT6 News
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2023 Corvette Z06 Gets Extra Cooling Capacity For Its 5.5L V8
The C8 Corvette Z06 has a total of five radiators.
2023 Corvette Z06 LT6 Engine Gets Lower Redline During Break-In Period
Down to 6,600 rpm for 500 miles.