This is an engine specification guide for General Motors’ fifth-generation supercharged LT4 engine that launched in 2015.
GM has built two different engines designated as the LT4:
- 1996–1997 LT4 – Gen II, 5.7L, small block
- 2015–Present LT4 – Gen V, 6.2L, supercharged small block
The high-performance 6.2L, supercharged Gen 5 LT4 debuted in the 2015 Chevy Corvette Z06.
LT4 6.2L engines are all aluminum and use Active Fuel Management (AFM) and Variable Valve Timing (VVT). The engines also use direct fuel injection technology, which shoots fuel directly into the combustion chamber instead of the intake runner.
The LT4 is not Flex Fuel-capable (E85).
The LT4 makes 195 horsepower and 195 ft.-lbs. of torque more than its naturally aspirated cousin, the LT1. To accomplish this, the LT4 uses:
- A compact, 1.7L blower
- A stronger crank, rods, and pistons
- Rotocast aluminum heads
Some versions of the LT4 came with a dry sump oiling system.
An LT4 6.2L crate engine is now available.
The information listed below is for a stock engine.
(Summit Racing’s Brian Nutter and Paul Spurlock contributed to this article.)
Chevy LT4 Engine Specs
LT4 Performance Specifications
| Engine Ratings | |
|---|---|
| Compression Ratio | 10:1 |
| Horsepower Rating | 640-650 hp @ 6,400 rpm |
| Torque Rating | 630-650 ft.-lbs. @ 3,600 rpm |
LT4 Applications
| VIN 8th Digit | Year | Make | Model |
|---|---|---|---|
| 6 | 2014-present | Chevrolet | Corvette Z06 |
| 6 | 2016-present | Cadillac | CTS-V |
| 6 | 2017-present | Chevrolet | Camaro ZL1 |
LT4 Engine Block Specs
| LT4 Block Specs | |
|---|---|
| Part Number | 19329617 |
| Material | 319-T7 Aluminum |
| Displacement | 6.2L / 376 c.i.d. |
| Bore Dia. | 4.065 in. |
| Stroke | 3.622 in. |
| Deck Height | 9.240 in. |
| Bore Spacing | 4.400 in. |
| Thrust Bearing Location | #3 Main, 1/2 thrust |
| Main Cap Style | 6-Bolt |
| Main Housing Bore Dia. | 2.751 in. |
| Cam Housing Bore Dia. | Bore 1/5 = 2.346 in. Bore 2/4 = 2.326 in. Bore 3 = 2.307 in. |
| Cam-to-Crank Centerline | 4.914 in. |
| Oil Squirters | 8 |
LT4 Cylinder Heads
| LT4 Cylinder Head Specs | |
|---|---|
| Part Number | 12646959 |
| Casting Number | 12646956 |
| Material | Rotocast A356-T6 Aluminum |
| Combustion Chamber Volume | 65.47cc |
| Intake Port Shape | Rectangle |
| Intake Runner Volume | -- |
| Intake Manifold Bolt Pattern | LT4 Specific |
| Exhaust Port Shape | Flat Oval |
| Exhaust Runner Volume | -- |
| Cylinder Head Bolt Style | Torque to Yield (TTY) |
| Cylinder Head Bolt Size | (10) M12 x 1.75, M8 corner bolts |
NOTE: Blank specifications are currently unavailable.
LT4 Camshafts
| LT4 Cam Specs | |
|---|---|
| Part Number | 12642245 |
| Duration @ .050 in. (int./exh.) | 189°/223° |
| Valve Lift (int./exh.) | 0.492 in./0.551 in. |
| Lobe Separation Angle | 120° |
| Cam Gear Attachment | 1-Bolt |
| Cam Gear Poles | 4X |
| Active Fuel Management (AFM) | Yes** |
| Variable Valve Timing (VVT) | Yes |
NOTE: **All versions used AFM with one exception — the Chevy Camaro ZL1 with manual transmission.
LT4 Valvetrain
| LT4 Valvetrain Specs | |
|---|---|
| Lifter Style | Hydraulic Roller |
| Lifter Link Style | Plastic Lifter Tray |
| Lifter Body Diameter | 0.842 in. |
| Pushrod Dimensions | 7.85 in. (long) x 0.342 (dia.) |
| Rocker Arm Mounting Style | Pedestal |
| Rocker Arm Style | Die-Cast, Roller Fulcrum |
| Rocker Ratio | 1.8 |
| Rocker Offset | None |
| Valve Spring Style | Beehive |
| Valve Spring Color | Natural |
| Intake Valve Angle | 12.5° / Splayed 2.61° |
| Exhaust Valve Angle | 12.0° / Splayed 2.38° |
| Intake Valve Material | Titanium, Solid Stem |
| Intake Valve Dia. | 2.126 in. |
| Exhaust Valve Material | Steel, Sodium Filled |
| Exhaust Valve Dia. | 1.590 in. |
| Timing Chain Guide Style | Spring-Loaded Tensioner |
Other Key LT4 Specs
| LT4 Supercharger, Throttle Body, Fuel Injector Specs & More | |
|---|---|
| Supercharger | Eaton 1.7L (R1740) |
| Supercharger | 7.88 in. (long) x 3.94 in. (dia.) - 160° Helix |
| Supercharger Drive | 3.1:1 drive ratio, 20,150 rpm max, 9.2-9.7 lbs. boost |
| Intercooler | 23% smaller than LS9, but 10% better heat rejection |
| Throttle Body | 87mm, 4-Bolt |
| Throttle Control | Electronic (Drive-by-Wire) |
| Fuel Injector P/N | 12684130 |
| Fuel Injector Flow | 141 lbs./hr. (2,940 max psi) |
| Flex Fuel Capable (E-85) | No |
| Computer | E92 |
| Crankshaft Reluctor Ring | 58x |
| Camshaft Sensor Location | Timing Cover |
| Oil Capacity (Wet Sump) | 10 qt. |
| Oil Capacity (Dry Sump) | 9.75 qt. |
I’m 72 and I just bought a 2017 ZO6 and I can’t drive it till good weather. It’s hell waiting. I thought the LT4 was a 427 but I’m not dissapointed to much. I have had a supercharged 383 1977 vette and a 400+hp 2001 convertible vette. I don’t like vettes that are stock.
[…] are currently just five LT engines, including the LT-based EcoTec3 truck engines: LT1, LT4, L83, L8B, and […]
Can i buy a LT4 SHORT BLOCK FROM gmpp. And install all my LT1 ACCESSORIES WITH A CENTRI SUPERCHARGER FOR MY 2018 GRAND SPORT? OTHERWISE I HAVE TO PULL THE ENGINE FILE FIT A SET OF DROP IN FORGED PISTONS AND RODS IN MY LT1 TO HAVE A FORGED LOW END.???
How can a complete Lt4 block for 1996 SS Impala
Is anyone here literate?
What range of oil pressure (Hi-Lo) is average on a 2017 on a 6.2 LT4?
Thanks in advance