Vehicle Applications

• 2010 Hummer H3
• 2010–2012 Chevrolet Colorado
• 2010–2012 GMC Canyon

Product Highlights

• Gen IV Aluminum Cylinder Block
• Cathedral Port Aluminum Cylinder Heads
• Variable Valve Timing (VVT)
• E85 Flex-Fuel Capability
• Advanced Electronic Throttle Control
• 58X Ignition System

LH9 Engine Specs (VIN "P")

The information listed here is for a stock engine.

Performance Specifications
Compression Ratio	9.6 : 1
Horsepower Rating	300 hp.
Torque Rating	320 ft./lbs.

 

Application Information
VIN 8th Digit	Year	Make	Model
P	2010	Hummer	H3
	2010-12	Chevrolet	Colorado
		GMC	Canyon

 

Engine Block Specifications
Casting Numbers	125771048, 12601900, 12569513, 12568573
Material	Aluminum
Displacement	5.3L / 325 c.i.d.
Bore Dia.	3.780 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 in. Bore 2/4 = 2.326 in. Bore 3 = 2.307 in.
Cam-to-Crank Centerline	4.914 in.

 

Rotating Assembly Specifications
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
Connecting Rod Casting Number (last three digits)	143
Crankshaft Material	Cast Iron
Crankshaft Part Number	12588614
Crankshaft Casting Number (last three digits)	216
Crankshaft Main Journal Dia.	2.559 in.
Crankshaft Rod Journal Dia.	2.100 in.
Reluctor Wheel	58X

 

Cylinder Head Specifications
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 Dia.	2.000 in.
Exhaust Valve Dia.	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

 

Camshaft Specifications
Part Number	12625437
Duration @ .050 in. (int./exh.)	190°/191°
Valve Lift (int./exh.)	0.457 in./0.466 in.
Lobe Separation	114°
Cam Gear Attachment	1-Bolt
Cam Gear Poles	4X
Active Fuel Management (AFM)	No
Variable Valve Timing (VVT)	Yes

 

Valvetrain Specifications
Lifter Style	Hydraulic Roller
Lifter Link Style	Plastic Lifter Tray
Lifter Body Dia.	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 Specifications
Intake Manifold	Truck-Style
Throttle Body	87mm, 4-bolt
Throttle Control	Electronic (Drive-by-Wire)
Fuel Injector P/N	12613411
Fuel Injector Flow	36 lb/hr @ 58 psi
Flex Fuel Capable (E-85)	Yes
Fuel Injector Length (between O-rings)	1.900 in.
Fuel Injector Connector	EV6 / USCAR
Computer	E67
Crankshaft Reluctor Ring	58X
Camshaft Sensor Location	Timing Cover
Oil Pan	Varies by Application
Oil Pump	High Volume (1.25 c.i./rev.)