Chevy LT 1 Engine Specs
Here in this article you will learn about the LT 1 Engine Specs , Performance, Cylinder Heads, Cam Specs & More, Let’s discuss the ford LT 1 Engine Specs , Valvetrain, performance, and Reviews.
This engine specification guide is for the fifth-generation LT1 General Motors engine, launched in 2014.
GM has three engines that are designated LT1: All-aluminum LT1 engines use Active Fuel Management and Variable Valve Timing.
Direct fuel injection technology is also used in the engines.
This allows fuel to be injected directly into the combustion chamber instead of pumped through the intake runners. The LT1 cannot use Flex Fuel (E85).
An LT1 6.2L crate engine is now available.
It’s also worth noting that specific Corvette models of the LT1 had a dry sump oiling mechanism.
This information is intended for a stock engine.
LT1 Block Specs |
|
|---|---|
| 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 |
| Casting Numbers | 12619171, 19329617 |
| Material | 319-T7 Aluminum |
LT1 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 | Steel, Hollow 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 |
Engine Ratings |
|
|---|---|
| Compression Ratio | 11.5: 1 |
| Horsepower Rating | 455 hp @ 6,000 rpm |
| Torque Rating | 460 ft./lbs. @ 4,600 rpm |
LT1 Cylinder Head Specs |
|
|---|---|
| Material | 319-T7 Aluminum |
| Combustion Chamber Volume | 59.02cc |
| Intake Port Shape | Rectangle |
| Intake Runner Volume | 297cc |
| Intake Manifold Bolt Pattern | LT1 Specific |
| Exhaust Port Shape | Flat Oval |
| Exhaust Runner Volume | 107cc |
| Intake Valve Diameter | 2.126 in. |
| Exhaust Valve Diameter | 1.590 in. |
| Cylinder Head Bolt Style | Torque to Yield (TTY) |
| Cylinder Head Bolt Size | (10) M12 x 1.75, M8 corner bolts |
| Part Numbers | 12678633, 12620544, 12620545 |
| Casting Numbers | 12620549 |
LT1 Cam Specs |
|
|---|---|
| Part Number | 12629512 |
| Duration @ .050 in. (int./exh.) | 200°/207° |
| Valve Lift (int./exh.) | 0.551 in./0.524 in. |
| Lobe Separation Angle | 116.5° |
| Cam Gear Attachment | 1-Bolt |
| Cam Gear Poles | 4X |
| Active Fuel Management (AFM) | Yes |
| Variable Valve Timing (VVT) | Yes |
LT1 Applications
| VIN 8th Digit | Year | Make | Model |
|---|---|---|---|
| 7 | 2014-present | Chevrolet | Corvette Stingray |
| 7 | 2017-present | Chevrolet | Corvette Grand Sport |
| 7 | 2016-present | Chevrolet | Camaro SS |
LT1 Rotating Assembly Specs |
|
|---|---|
| Piston Style | Domed (with reliefs for the exhaust valve and direct injector) |
| Piston Volume | 0.6cc (net) |
| Wrist Pin Dia. | 0.9431 in. (full floating) |
| Connecting Rod Material | Powdered Metal |
| Connecting Rod Style | I-Beam |
| Connecting Rod Length | 6.098 in. |
| Connecting Rod Housing Bore | 2.225 in. |
| Connecting Rod Bolts | M9 x 1 x 43 |
| Connecting Rod Part Number | 12654242 |
| Crankshaft Material | 1538MV Forged Steel |
| Crankshaft Part Number (Wet Sump) | 12623492 |
| Crankshaft Part Number (Dry Sump) | 12629940 |
| Crankshaft Main Journal Dia. | 2.559 in. |
| Crankshaft Rod Journal Dia. | 2.100 in. |
| Reluctor Wheel | 58X |
| Harmonic Balancer | Iron |
| Piston Material | Hypereutectic Cast Aluminum Alloy |
LT1 Throttle Body, Fuel Injectors, Oil Pan Specs & More |
|
|---|---|
| Throttle Body | 87mm, 4-Bolt |
| Throttle Control | Electronic (Drive-by-Wire) |
| Fuel Injector P/N | 12656931 |
| Fuel Injector Flow | 123 lbs./hr. (2,205 max psi) |
| Flex Fuel Capable (E-85) | No |
| Computer | E92 |
| Crankshaft Reluctor Ring | 58x |
| Camshaft Sensor Location | Timing Cover |
| Oil Capacity (Wet Sump) | 6.5 qt. |
| Oil Capacity (Dry Sump) | 9.75 qt. |
| Intake Manifold | Car-Style |
| Throttle Body | 87mm, 4-Bolt |
Chevy LT 1 Engine Specs Review Video
Chevy LT1 Engine Specs FAQ
What engine is in a LT1?
In 1992, General Motors introduced the LT1, a performance 350cu in (5.7 L) engine based on the Chevy small block V8. It was named to honor the first LT-1.
Is an LT1 a good engine?
All in all, the LT1 is an extremely reliable engine. The OptiSpark distributor issue is the only issue likely to occur with this model.
Head gaskets are generally safe, provided the engine doesn’t get overheated.
Is a LT1 a Corvette engine?
The LT1 was named after the initial LT-1 solid lifter, a high-pressure 350 cubic block found in the 1970s in the early Corvettes and Camaros.
Eventually, the version of 1990 would make its way into these identical vehicles.
How many LT1 engines are there?
three different engines
General Motors produced three distinct engines called LT1 from 1970 to19722LT-1. This is Chevrolet Generation I Small-Block.
1992-1997 LT1 – GM Generation II Small-Block. 2013-(current), LT1 – GM Generation V Small-Block.
Is a LT1 a big block?
The LT1 is one of the most technologically advanced engines on the planet.
It also represents the most significant redesign of the small block ever.
