My Cart
L8B 5.3L
V8 "GEN V" w/ eAssist Mild Hybrid System
Vehicle Applications
- 2016+ Chevrolet Silverado
- 2016+ GMC Sierra
Product
Highlights
- Gen V Aluminum Cylinder Block
- eAssist
Mild Hybrid System
- Direct Fuel Injection
- Variable Valve TIming (VVT)
- Active Fuel Management (AFM)
- E85 Flex-Fuel Capability
- Advanced
Electronic Throttle Control
- 58X Ignition Systems
- The 5.3L L83 V-8 engine is mated to a mild hybrid eAssist system in order to deliver uncompromised capability and better fuel economy – up to 13 percent – in city driving.
- The mild hybrid belt alternator-starter (BAS) system with a compact lithium-ion battery is joined with the 5.3L EcoTec L83 V-8 engine and 8-speed automatic transmission.
- Electric Power Boost: the on-board electric motor provides up to 13 horsepower and 44 pound-feet of supplemental power during acceleration and passing. The electric motor also enables the Active Fuel Management (AFM) system on the 5.3L V-8 engine to operate in 4-cylinder mode for longer periods, resulting in additional fuel economy benefits.
- Stop/Start capability: added fuel savings are achieved by seamlessly turning the engine off when stopped at a traffic light or in congested traffic and turning the engine back on when the driver’s foot lifts off the brake pedal.
- Regenerative Braking: by using the on-board electric motor as a generator, the energy recovered while braking is converted to electricity to recharge the onboard battery system.
- Power for the eAssist system is supplied by a 24-cell, air-cooled 0.45 kWh lithium-ion battery pack located under the center console (or front bench seat) that uses the same battery cells as the Chevrolet Malibu Hybrid.
L8B Engine Specs (VIN "R")
The information listed here is for a stock engine.
| Performance Specifications | |
| Compression Ratio | 11:1 |
| Horsepower Rating | 355-380 hp @ 5,600 rpm |
| Torque Rating | 383-416 ft.-lbs. @ 4,100 rpm |
**Horsepower and torque
ranges account for the difference between gasoline and E85 fuel.**
| Application Information | |||
| VIN 8th Digit | Year | Make | Model |
| R (L8B) | 2016-Present | Chevrolet | Silverado |
| 2016-Present | GMC | Sierra | |
| Engine Block Specifications | |
| Part Number | 12620290 |
| Material | 319-T7 Aluminum |
| Displacement | 5.3L / 325 c.i.d. |
| Bore Dia. | 3.780 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. |
| Rotating Assembly Specifications | |
| Piston Material | Hypereutectic Cast Aluminum Alloy |
| Piston Style | Domed (with reliefs for the exhaust valve and direct injector) |
| Piston Volume | 0cc (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 | 12607475 |
| Crankshaft Material | Cast Iron |
| Crankshaft Part Number | 12619781 |
| Crankshaft Main Journal Dia. | 2.559 in. |
| Crankshaft Rod Journal Dia. | 2.100 in. |
| Reluctor Wheel | 58X |
| Harmonic Balancer | Iron |
| Cylinder Head Specifications | |
| Casting Number | 12620214 |
| Material | 319-T7 Aluminum |
| Combustion Chamber Volume | 57.6cc |
| Intake Port Shape | Rectangle |
| Intake Runner Volume | 248cc |
| Exhaust Port Shape | Flat Oval |
| Exhaust Runner Volume | 102cc |
| Cylinder Head Bolt Style | Torque to Yield (TTY) |
| Cylinder Head Bolt Size | (10) M12 x 1.75, M8 corner bolts |
| Camshaft Specifications | ||
| Part Number | 12619823 | |
| Duration @ .050 in. (int./exh.) | -°/-° | |
| Valve Lift (int./exh.) | 0.- in./0.- in. | |
| Lobe Separation | -° | |
| Cam Gear Attachment | 1-bolt | |
| Cam Gear Poles | 4X | |
| Active Fuel Management (AFM) | Yes | |
| Variable Valve Timing (VVT) | Yes | |
| Valvetrain Specifications | |
| Lifter Style | Hydraulic Roller |
| Lifter Link Style | Plastic Lifter Tray |
| Lifter Body Dia. | 0.842 in. |
| Pushrod Dimensions | 7.850 in. (long) x 0.342 in. (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, Solid Stem |
| Intake Valve Dia. | 1.928 in. |
| Exhaust Valve Material | Steel, Solid Stem |
| Exhaust Valve Dia. | 1.556 in. |
| Timing Chain Guide Style | Spring Loaded Tensioner |
| Other Specifications | ||
| Intake Manifold | Truck style | |
| Throttle Body | 80mm, 4-bolt | |
| Throttle Control | Electronic (Drive-by-Wire) | |
| Fuel Injector P/N | 12656932 | |
| Fuel Injector Flow | - lbs./hr. (- max psi) | |
| Flex Fuel Capable (E-85) | Yes | |
| Computer | E92 | |
| Crankshaft Reluctor Ring | 58X | |
| Camshaft Sensor Location | Timing Cover | |
| Oil Pan | Varies by Application | |
| Oil Pump | Variable Displacement | |