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Chevy LQ9 Engine Specs
The LQ9 is a Gen. 3 small block engine used in GM trucks between 2002 and 2007. For marketing purposes, it was also known as the Vortec ** 6000 or VortecMAX. The information listed here is for the stock engine.
LQ9 Performance Specifications
Engine Ratings
Compression Ratio 10.1:1
Horsepower Rating 345 hp
Torque Rating 380 ft./lbs.
LQ9 Applications
VIN 8th Digit Year Make Model
N 2002-06 Cadillac Escalade
N 2002-06 Cadillac Escalade EXT
N 2002-06 Cadillac Escalade ESV
N 2003-07 Chevy Silverado SS
N 2004-06 Chevy Silverado ** Edition
N 2004-06 GMC Sierra ** Edition
N 2006-07 Chevy Silverado Classic VortecMAX
N 2006-07 GMC Sierra 1500 Classic VortecMAX
LQ9 Engine Blocks
LQ9 Block Specs
Casting Numbers 12551364, 12573581, 12577184
Material Iron
Displacement 6.0L / 364 c.i.d.
Bore Dia. 4.000 in.
Stroke 3.622 in.
Deck Height 9.230 - 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. (2002-03) Bore 1/5 = 2.326, Bore 2/4 = 2.317, Bore 3 = 2.307
Cam Housing Bore Dia. (2003-07) Bore 1/5 = 2.346, Bore 2/4 = 2.326, Bore 3 = 2.307
Cam-to-Crank Centerline 4.914 in.
LQ9 Rotating Assembly
LQ9 Rotating Assembly Specs
Piston Material Hypereutectic Cast Aluminum Alloy
Piston Style Flat Top
Piston Volume 0cc
Wrist Pin Dia. 0.9429 in., 0.9431 in.
(Full Floating)
Connecting Rod Material Powdered Metal
Connecting Rod Style I-Beam
Connecting Rod Length 6.098 in.
Connecting Rod Bolts M9 x 1 x 43
Crankshaft Material Cast Iron
Crankshaft Main Journal 2.559 in.
Crankshaft Rod Journal 2.100 in.
Reluctor Wheel 24X
Flexplate/Flywheel Mounting Flange 0.857 in.
LQ9 Cylinder Heads
LQ9 Cylinder Head Specs
Casting Numbers 035, 317
Material Aluminum
Combustion Chamber Volume 71cc
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 1.550 in.
Cylinder Head Bolt Style Torque to Yield (TTY)
Cylinder Head Bolt Size 2002-03 (8) M11 x 2 x 155, (2) M11 x 2 x 100, (5) M8 x 1.25 x 45
Cylinder Head Bolt Size 2004-07 (10) M11 x 2 x 100, (5) M8 x 1.25 x 45
LQ9 Cam Specifications
LQ9 Cam Specs
Part Number 12561721
Duration @ .050 in. (int./exh.) 196/201
Valve Lift (int./exh.) 0.467 in./0.479 in.
Lobe Separation Angle 116°
Cam Gear Attachment 3-Bolt
LQ9 Valvetrain Specs
LQ9 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. 1.550 in.
Other Key LQ9 Specs
LQ9 Throttle Body, Fuel Injectors, Oil Pan Specs & More
Intake Manifold Truck Style
Throttle Body 80mm, 3-Bolt
Throttle Control Electronic, Drive-by-Wire
Fuel Injector Flow 25.2 lbs./hr.
Fuel Injector Length (between O-Rings) 1.9 in.
Fuel Injector Connector EV6
PCM Warren
Crankshaft Reluctor Ring 24x
Camshaft Sensor Rear Mount, 1x on Cam
Oil Pan
Deep Rear Sump
Oil Pump Standard Volume
Chevy LQ9 Engine Specs
The LQ9 is a Gen. 3 small block engine used in GM trucks between 2002 and 2007. For marketing purposes, it was also known as the Vortec ** 6000 or VortecMAX. The information listed here is for the stock engine.
LQ9 Performance Specifications
Engine Ratings
Compression Ratio 10.1:1
Horsepower Rating 345 hp
Torque Rating 380 ft./lbs.
LQ9 Applications
VIN 8th Digit Year Make Model
N 2002-06 Cadillac Escalade
N 2002-06 Cadillac Escalade EXT
N 2002-06 Cadillac Escalade ESV
N 2003-07 Chevy Silverado SS
N 2004-06 Chevy Silverado ** Edition
N 2004-06 GMC Sierra ** Edition
N 2006-07 Chevy Silverado Classic VortecMAX
N 2006-07 GMC Sierra 1500 Classic VortecMAX
LQ9 Engine Blocks
LQ9 Block Specs
Casting Numbers 12551364, 12573581, 12577184
Material Iron
Displacement 6.0L / 364 c.i.d.
Bore Dia. 4.000 in.
Stroke 3.622 in.
Deck Height 9.230 - 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. (2002-03) Bore 1/5 = 2.326, Bore 2/4 = 2.317, Bore 3 = 2.307
Cam Housing Bore Dia. (2003-07) Bore 1/5 = 2.346, Bore 2/4 = 2.326, Bore 3 = 2.307
Cam-to-Crank Centerline 4.914 in.
LQ9 Rotating Assembly
LQ9 Rotating Assembly Specs
Piston Material Hypereutectic Cast Aluminum Alloy
Piston Style Flat Top
Piston Volume 0cc
Wrist Pin Dia. 0.9429 in., 0.9431 in.
(Full Floating)
Connecting Rod Material Powdered Metal
Connecting Rod Style I-Beam
Connecting Rod Length 6.098 in.
Connecting Rod Bolts M9 x 1 x 43
Crankshaft Material Cast Iron
Crankshaft Main Journal 2.559 in.
Crankshaft Rod Journal 2.100 in.
Reluctor Wheel 24X
Flexplate/Flywheel Mounting Flange 0.857 in.
LQ9 Cylinder Heads
LQ9 Cylinder Head Specs
Casting Numbers 035, 317
Material Aluminum
Combustion Chamber Volume 71cc
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 1.550 in.
Cylinder Head Bolt Style Torque to Yield (TTY)
Cylinder Head Bolt Size 2002-03 (8) M11 x 2 x 155, (2) M11 x 2 x 100, (5) M8 x 1.25 x 45
Cylinder Head Bolt Size 2004-07 (10) M11 x 2 x 100, (5) M8 x 1.25 x 45
LQ9 Cam Specifications
LQ9 Cam Specs
Part Number 12561721
Duration @ .050 in. (int./exh.) 196/201
Valve Lift (int./exh.) 0.467 in./0.479 in.
Lobe Separation Angle 116°
Cam Gear Attachment 3-Bolt
LQ9 Valvetrain Specs
LQ9 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. 1.550 in.
Other Key LQ9 Specs
LQ9 Throttle Body, Fuel Injectors, Oil Pan Specs & More
Intake Manifold Truck Style
Throttle Body 80mm, 3-Bolt
Throttle Control Electronic, Drive-by-Wire
Fuel Injector Flow 25.2 lbs./hr.
Fuel Injector Length (between O-Rings) 1.9 in.
Fuel Injector Connector EV6
PCM Warren
Crankshaft Reluctor Ring 24x
Camshaft Sensor Rear Mount, 1x on Cam
Oil Pan
Deep Rear Sump
Oil Pump Standard Volume
