The LFA is a 6.0L, Gen. 4 small block engine used in GM hybrid trucks and SUVs between 2008 and 2009. The LFA was upgraded with AFM and VVT.
For marketing purposes, it was known as the Hybrid Vortec 6000.
The engine specs and information listed below is for the stock LFA engine.
Mechanically similar, General Motors’ LS and LS-based Vortec engines wound up on almost every branch of the GM family tree: Chevy, Pontiac, GMC, Cadillac, Buick—heck, even Saab, Hummer, and Isuzu got some LS love.
Since LS and Vortec engines are so common, they’ve become the go-to performance and swap engines of the modern era.
These motors are capable of making a lot of horsepower, and respond well to upgrades like turbos, superchargers, high-flow cylinder heads, intake systems, cams, and nitrous oxide.
[Looking to upgrade your LFA engine? Check out LFA 6.0L Engine Upgrade Guide: Expert Advice for LFA Mods to Maximize Performance.]
The aftermarket is strong, crate engines are available, and used motors are often cheaply sourced through junkyards.
Summit Racing has created a series of comprehensive guides for each engine in the LS family, so engine builders and tuners can have a handy reference for their projects.
This guide is specifically about the GM LFA 6.0L. You can find our other LS engine spec guides and LS-related tech articles here.
(Summit Racing’s Paul Spurlock and Brian Nutter contributed to this article.)
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Chevy LFA 6.0L Engine Specs
LFA Performance Specifications
| LFA Engine Ratings | |
|---|---|
| Compression Ratio | 10.7:1 |
| Horsepower Rating | 332 hp |
| Torque Rating | 367 ft./lbs. |
LFA Applications
| VIN 8th Digit | Year | Make | Model |
|---|---|---|---|
| 5 | 2008-09 | Chevy | Silverado Hybrid |
| 5 | 2008-09 | GMC | Sierra Hybrid |
| 5 | 2008-09 | Chevy | Tahoe Hybrid |
| 5 | 2008-09 | GMC | Yukon Hybrid |
| 5 | 2008-09 | Cadillac | Escalade Hybrid |
LFA Engine Blocks
| LFA Engine Block Specs | |
|---|---|
| Casting Numbers | 12568952 |
| Material | Aluminum |
| Displacement | 6.0L / 364 c.i.d. |
| Bore Dia. | 4.000 in. |
| Stroke | 3.622 in. |
| Deck Height | 9.240 in. |
| Bore Spacing | 4.400 in. |
| Thrust Bearing Location | #3 Main |
| Main Cap Style | 6-Bolt |
| Main Housing Bore Dia. | 2.751 in. |
| Cam Housing Bore Dia. | Bore 1/5 = 2.346, Bore 2/4 = 2.326, Bore 3 = 2.307 |
| Cam-to-Crank Centerline | 4.914 in. |
LFA Rotating Assembly
| LFA Rotating Assembly Specs | |
|---|---|
| Piston Material | Hypereutectic Cast Aluminum Alloy |
| Piston Style | Flat Top, with valve reliefs |
| Piston Volume | +3cc |
| 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 | 12649190 |
| Crankshaft Material | Cast Iron |
| Crankshaft Part Number | 12588613 |
| Crankshaft Main Journal | 2.559 in. |
| Crankshaft Rod Journal | 2.100 in. |
| Reluctor Wheel | 58X |
LFA Cylinder Heads
| LFA Cylinder Heads Specs | |
|---|---|
| Casting Numbers | 799, 243 |
| Material | Aluminum |
| Combustion Chamber Volume | 65cc |
| Intake Port Shape | Cathedral |
| Intake Runner Volume | 210cc |
| Exhaust Port Shape | D-Port |
| Exhaust Runner Volume | 75cc |
| Intake Valve Diameter | 2.000 in. |
| Exhaust Valve Diameter | 1.575 in. |
| Cylinder Head Bolt Style | Torque to Yield (TTY) |
| Cylinder Head Bolt Size | (10) M11 x 2 x 100, (5) M8 x 1.25 x 45 |
LFA Cam Specifications
| LFA Cam Specs | |
|---|---|
| Camshaft Part Number | 12629698 |
| Duration @ .050 in. (int./exh.) | 200°/208° |
| Valve Lift (int./exh.) | 0.472 in./0.479 in. |
| Lobe Separation | 116° |
| Cam Gear Attachment | 1-Bolt |
| Cam Gear Poles | 4x |
| Active Fuel Management (AFM) | Yes |
| Variable Valve Timing (VVT) | Yes |
LFA Valvetrain
| LFA Valvetrain Specs | |
|---|---|
| Lifter Style | Hydraulic Roller |
| Lifter Link Style | Plastic Lifter Tray |
| Lifter Body Diameter | 0.842 in. |
| Pushrod Length | 7.385 in. |
| Rocker Arm Mounting Style | Pedestal |
| Rocker Arm Style | Die-Cast, Roller Fulcrum |
| Rocker Ratio | 1.7 |
| Rocker Offset | None |
| Valve Spring Style | Beehive |
| Valve Spring Color | Natural |
| Valve Angle | 15 Degrees |
| Intake Valve Material | Steel - Solid Stem |
| Intake Valve Dia. | 2.000 in. |
| Exhaust Valve Material | Steel - Solid Stem |
| Exhaust Valve Dia. | 1.575 in. |
| Timing Chain Guide Style | Spring Loaded Tensioner |
Other Key LFA Specs
| Throttle Body, Fuel Injectors, Oil Pan Specs & More | |
|---|---|
| Intake Manifold | Truck-Style |
| Throttle Body | 87mm, 4-bolt |
| Throttle Control | Electronic, Drive-by-Wire |
| Fuel Injector Part Number | 12580681 |
| Fuel Injector Flow | 30 lbs./hr. @ 58 psi |
| Flex Fuel Capable (E-85) | No |
| Fuel Injector Length (between O-Rings) | 1.870 in. |
| Fuel Injector Connector | EV6-USCAR |
| Computer | E67 |
| Crankshaft Reluctor Ring | 58X |
| Camshaft Sensor Location | Front Timing Cover, 4X |
| Oil Pan | Varies by Model |
| Oil Pump | Variable Displacement |
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NOTE: You can find engine specs and detailed engine upgrade advice for every LS and LS-based Vortec truck engine in one place: The Definitive Guide to LS Engine Specs and LS Engine Upgrades.
[…] [Every engine spec you’ll need for an LFA project can be found here: LFA Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More.] […]
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