LS Engines

LFA 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More

 
LFA Vortec 6000 6.0L engine - Top Speed

(Image/Top Speed)

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.

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.)

Chevy LFA 6.0L Engine Specs

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 information listed below is for the stock engine.

LFA Performance Specifications

LFA Engine Ratings
Compression Ratio10.7:1
Horsepower Rating332 hp
Torque Rating367 ft./lbs.

LFA Applications

VIN 8th DigitYearMakeModel
52008-09ChevySilverado Hybrid
52008-09GMCSierra Hybrid
52008-09ChevyTahoe Hybrid
52008-09GMCYukon Hybrid
52008-09CadillacEscalade Hybrid

LFA Engine Blocks

LFA Engine Block Specs
Casting Numbers12568952
MaterialAluminum
Displacement6.0L / 364 c.i.d.
Bore Dia. 4.000 in.
Stroke3.622 in.
Deck Height9.240 in.
Bore Spacing4.400 in.
Thrust Bearing Location#3 Main
Main Cap Style6-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 Centerline4.914 in.

LFA Rotating Assembly

LFA Rotating Assembly Specs
Piston MaterialHypereutectic Cast Aluminum Alloy
Piston StyleFlat Top, with valve reliefs
Piston Volume+3cc
Wrist Pin Dia.0.9431 in. (full floating)
Connecting Rod MaterialPowdered Metal
Connecting Rod StyleI-Beam
Connecting Rod Length6.098 in.
Connecting Rod Housing Bore2.225 in.
Connecting Rod BoltsM9 x 1 x 43
Connecting Rod Part Number12649190
Crankshaft MaterialCast Iron
Crankshaft Part Number12588613
Crankshaft Main Journal2.559 in.
Crankshaft Rod Journal2.100 in.
Reluctor Wheel58X

LFA Cylinder Heads

LFA Cylinder Heads Specs
Casting Numbers799, 243
MaterialAluminum
Combustion Chamber Volume65cc
Intake Port ShapeCathedral
Intake Runner Volume210cc
Exhaust Port ShapeD-Port
Exhaust Runner Volume75cc
Intake Valve Diameter2.000 in.
Exhaust Valve Diameter1.575 in.
Cylinder Head Bolt StyleTorque 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 Number12629698
Duration @ .050 in. (int./exh.)200°/208°
Valve Lift (int./exh.)0.472 in./0.479 in.
Lobe Separation116°
Cam Gear Attachment1-Bolt
Cam Gear Poles4x
Active Fuel Management (AFM) Yes
Variable Valve Timing (VVT)Yes

LFA Valvetrain

LFA Valvetrain Specs
Lifter StyleHydraulic Roller
Lifter Link StylePlastic Lifter Tray
Lifter Body Diameter0.842 in.
Pushrod Length7.385 in.
Rocker Arm Mounting StylePedestal
Rocker Arm StyleDie-Cast, Roller Fulcrum
Rocker Ratio1.7
Rocker OffsetNone
Valve Spring StyleBeehive
Valve Spring ColorNatural
Valve Angle15 Degrees
Intake Valve MaterialSteel - Solid Stem
Intake Valve Dia.2.000 in.
Exhaust Valve MaterialSteel - Solid Stem
Exhaust Valve Dia.1.575 in.
Timing Chain Guide StyleSpring Loaded Tensioner

Other Key LFA Specs

Throttle Body, Fuel Injectors, Oil Pan Specs & More
Intake ManifoldTruck-Style
Throttle Body87mm, 4-bolt
Throttle ControlElectronic, Drive-by-Wire
Fuel Injector Part Number12580681
Fuel Injector Flow30 lbs./hr. @ 58 psi
Flex Fuel Capable (E-85)No
Fuel Injector Length (between O-Rings)1.870 in.
Fuel Injector ConnectorEV6-USCAR
ComputerE67
Crankshaft Reluctor Ring58X
Camshaft Sensor LocationFront Timing Cover, 4X
Oil PanVaries by Model
Oil PumpVariable Displacement
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