Vehicle Applications

• 2005–2006 Chevrolet SSR
• 2006–2009 Chevrolet Trailblazer SS
• 2008–2009 Saab 9-7X Aero

Product Highlights

• Gen IV Aluminum Cylinder Block
• Cathedral Port Aluminum Cylinder Heads
• Advanced Electronic Throttle Control
• 58X Ignition System

LS2 Truck Engine Specs (VIN "H")

 The information listed here is for a stock engine.

Performance Specifications
Compression Ratio	10.9 : 1
Horsepower Rating	390-395 hp.
Torque Rating	400 ft./lbs.

 

Application Information
VIN 8th Digit	Year	Make	Model
H	2005-06	Chevrolet	SSR
	2006-09	Chevrolet	Trailblazer SS
	2008-09	Saab	9-7X Aero

 

Engine Block Specifications
Casting Numbers	12568952, 12560799
Material	Aluminum
Displacement	6.0L / 364 c.i.d.
Bore Dia.	4.000 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
Piston Volume	0cc
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 P/N	12649190
Connecting Rod Casting Number (last three digits)	143
Crankshaft Material	Cast Iron
Crankshaft P/N	12569768
Crankshaft Casting Number (last three digits)	216
Crankshaft Main Journal Dia.	2.559 in.
Crankshaft Rod Journal Dia.	2.100 in.
Reluctor Wheel	24X (2005-06), 58X (2007-09)

 

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
Years	2005-06	2007-09
Camshaft P/N	12574519	12593206
Duration @ .050 in. (int./exh.)	204°/213°	204°/211°
Valve Lift (int./exh.)	0.520 in./0.521 in.	0.524 in./0.524 in.
Lobe Separation	116°	117°
Cam Gear Attachment	3-Bolt	1-Bolt
Cam Gear Poles	1X	4X
Active Fuel Management (AFM)	No
Variable Valve Timing (VVT)	No

 

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	Plastic Guide (2005-06), Spring Loaded Tensioner (2007-09)

 

Other Specifications
Years	2005-06	2007-09
Intake Manifold	Truck-Style
Throttle Body	87mm, 4-bolt, silver blade (Gold blade in 2009 only)
Throttle Control	Electronic (Drive-by-Wire)
Fuel Injector P/N	12569113	89017586
Fuel Injector Flow	34 lb/hr @ 58 psi
Flex Fuel Capable (E-85)	No
Fuel Injector Length (between O-rings)	2.050 in.
Fuel Injector Connector	EV6 / USCAR
Computer	E40	E67
Crankshaft Reluctor Ring	24X	58X
Camshaft Sensor Location	Timing Cover
Oil Pan	Varies by Model
Oil Pump	Standard Volume (0.96 c.i./rev.)