Vehicle Applications

• 2002–2006 Cadillac Escalade
• 2002–2006 Cadillac Escalade EXT
• 2002–2006 Cadillac Escalade ESV
• 2003–2007 Chevrolet Silverado SS
• 2004–2006 Chevrolet Silverado HO Edition
• 2004–2006 GMC Silverado HO Edition
• 2006–2007 Chevrolet Silverado Classic Vortec Max
• 2006–2007 GMC Sierra Classic Vortec Max

Product Highlights

• Gen III Iron Cylinder Block
• Cathedral Port Aluminum Cylinder Heads
• Drive By Wire (Electronic Throttle) 
• 24X Ignition Systems

LQ9 Engine Specs (VIN "N")

Performance Specifications
Compression Ratio	10.1:1
Horsepower Rating	345 hp
Torque Rating	380 ft./lbs.

 

Application Information
VIN 8th Digit	Year	Make	Model
N	2002-06	Cadillac	Escalade
			Escalade EXT
			Escalade ESV
	2003-07	Chevrolet	Silverado SS
	2004-06	Chevrolet	Silverado HO Edition
		GMC	Sierra HO Edition
	2006-07	Chevrolet	Silverado Classic Vortec Max
		GMC	Sierra Classic Vortec Max

 

Engine Block Specifications
Casting Numbers	12551364, 12573581, 12577184
Material	Iron
Displacement	6.0L / 364 cid
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 Diameter	2.751 in.
Cam Housing Bore Diameter	Bore 1/5 = 2.326, Bore 2/4 = 2.317, Bore 3 = 2.307 (2002-03 1st design)
	Bore 1/5 = 2.346, Bore 2/4 = 2.326, Bore 3 = 2.307 (2003- 07 2nd design)
Cam-to-Crank Centerline	4.914 in.

 

Rotating Assembly Specifications
Piston Material	Hypereutectic Cast Aluminum Alloy
Piston Style	Flat Top
Piston Volume	0cc
Wrist Pin Dia. (2002-07)	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.

 

Cylinder Head Specifications
Years	2002-07
Casting Numbers	035, 317
Combustion Chamber Volume	71cc
Material	Aluminum
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

 

Camshaft Specifications
Years	2002-07
Part Number	12561721
Duration at .050 in (int./exh)	196/201
Valve Lift (int./exh)	0.467 in./0.479 in.
Lobe Separation Angle (in degrees)	116
Cam Gear Attachment	3-Bolt

 

Valvetrain Specifications
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 Specifications
Intake Manifold	Truck Style
Throttle Body	80mm, 3-Bolt
Throttle Control	Electronic (Drive-by-Wire)
Fuel Injector Flow	25.2 lb/hr @ 58 psi
Fuel Injector Length (between O-Rings)	1.900 in.
Fuel Injector Connector	Mini-Delphi / Multec2
PCM	Warren
Crankshaft Reluctor Ring	24x
Camshaft Sensor	Rear Mount, 1x on cam
Oil Pan	Deep Rear Sump
Oil Pump	Standard Volume