LS Engines

LC8 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More

(Image/GM Global Propulsion Systems)

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 LC8. You can find our other LS engine spec guides and LS-related tech articles here.(S

Chevy 6.0L LC8 Engine Specs

The LC8 engine is a 6.0L Gen. 4 small block engine used in GM trucks and SUVs between 2011 and 2019. It is unique among the Gen. 3 and Gen. 4 engines in that it’s the only one designed to operate on Gasoline and LPG or CNG fuels. It’s also unique in that it’s the last of the Vortec Gen. 4 engine to be used in vehicles. The information listed here is for a stock engine.

LC8 Performance Specifications

LC8 Engine Ratings
Compression Ratio9.7:1
Horsepower Rating342-360 hp Gasoline; 282-301 hp CNG; 332 hp LPG
Torque Rating373-380 ft./lbs. Gasoline; 320-333 ft./lbs. CNG; 370 ft./lbs. LPG

LC8 Applications

VIN 8th DigitYearMakeModel
B2011-19ChevyExpress Van LPG (Cargo Cutaway)
B2011-19GMCSavana Van LPG (Cargo Cutaway)
B2011-19ChevyExpress Van CNG (Cargo Cutaway)
B2011-19GMCSavana Van CNG (Cargo Cutaway)
B2011-19ChevySilverado HD CNG
B2011-19GMCSierra HD CNG

LC8 Engine Blocks

LC8 Engine Block Specs
Casting Numbers12576181
MaterialIron
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.

LC8 Rotating Assembly

LC8 Rotating Assembly Specs
Piston MaterialHypereutectic Cast Aluminum Alloy
Piston StyleDished, with valve reliefs
Piston Volume+6.7cc
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 Number12607475
Connecting Rod Casting Number (last 4 digits)3847
Crankshaft MaterialCast Iron
Crankshaft Casting Number (last 3 digits)216
Crankshaft Main Journal2.559 in.
Crankshaft Rod Journal2.100 in.
Reluctor Wheel58X

LC8 Cylinder Heads

LC8 Cylinder Heads Specs
Casting Numbers5364, 823
MaterialAluminum
Combustion Chamber Volume70cc
Intake Port ShapeRectangle
Intake Runner Volume257cc
Exhaust Port ShapeD-Port
Exhaust Runner Volume87cc
Intake Valve Diameter2.165 in.
Exhaust Valve Diameter1.590 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

LC8 Cam Specifications

LC8 Cam Specs
Duration @ .050 in. (int./exh.)198°/208°
Valve Lift (int./exh.)0.467 in./0.479 in.
Lobe Separation116°
Cam Gear Attachment1-Bolt
Cam Gear Poles4x
Active Fuel Management (AFM) No
Variable Valve Timing (VVT)Yes

LC8 Valvetrain

LC8 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 OffsetIntake Rocker
Valve Spring StyleBeehive
Valve Spring ColorNatural
Valve Angle15 Degrees
Intake Valve MaterialSIL-1 Nitride Steel (unique alloy to LC8) - Solid Stem
Intake Valve Dia.2.165 in.
Exhaust Valve MaterialInconel Steel (unique alloy to LC8) - Solid Stem
Exhaust Valve Dia.1.590 in.
Valve Seat MaterialBrico 3010 (Unique for CNG/LPG durability)

Other LC8 Specs

LC8 Throttle Body, Fuel Injectors, Oil Pan Specs & More
Intake ManifoldTruck-Style
Throttle Body87mm, 4-bolt
Throttle ControlElectronic, Drive-by-Wire
Fuel Injector Part Number12613412
Fuel Injector Flow49.2 lbs./hr. @ 58 psi
Flex Fuel Capable (E-85)No
Fuel Injector Length (between O-Rings)1.771 in.
Fuel Injector ConnectorEV6-USCAR
ComputerE38
Crankshaft Reluctor Ring58X
Camshaft Sensor LocationFront mount, 4X on cam
Oil PanDeep Rear Sump
Oil PumpStandard Flow (0.96 c.i. per rev)
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