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.

5.5L LT6 Engine Vitals
Displacement:	6.2L / 333.3 cu. in.
Aspiration:	Natural
Vehicles:	Corvette C8 Z06
Introduced:	2023 model year
Discontinued:	-
Predecessor:	-
Successor:	-
Assembly:	Performance Build Center, 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 LT6 engine represents an all-new, sixth-generation DOHC V8 engine family that’s derived from the 4.2L Cadillac Blackwing engine (RPO Code LTA). In addition, the LT6 will derive the LT7, a twin-turbocharged version of the LT6 that will be used in the C8 ZR1 and C8 Zora.