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LC9

LC9 Vortec 5.3L V8 "GEN IV"

Vehicle Applications

  • 2007–2011 Chevrolet Avalanche
  • 2007–2011 Chevrolet Silverado 1500
  • 2007–2011 GMC Sierra 1500
  • 2007–2011 Chevrolet Suburban
  • 2007–2011 GMC Yukon XL
  • 2009–2010 GMC Yukon 
  • 2009–2011 Chevrolet Tahoe 

Product Highlights

  • Gen IV Aluminum Cylinder Block
  • Cathedral Port Aluminum Cylinder Heads
  • Variable Valve TIming (VVT) (2010-2011)
  • Active Fuel Management (AFM) / Displacement on Demand (DOD)
  • E85 Flex-Fuel Capability
  • Advanced Electronic Throttle Control
  • 58X Ignition System

LC9 Engine Specs (VIN "3" or "7")

The information listed here is for a stock engine.

Performance Specifications

Compression Ratio 9.9 : 1 (2007-09), 9.6 : 1 (2010-11)
Horsepower Rating 302-315 hp.
Torque Rating 330-338 ft./lbs.

 

Application Information

VIN 8th Digit

Year

Make

Model

3

2007-11

Chevrolet

Avalanche

Silverado 1500

GMC

Sierra 1500

Chevrolet

Suburban

GMC

Yukon XL

2009-10

GMC

Yukon

2009-11

Chevrolet

Tahoe

 

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 (2007-09), Flat Top with valve reliefs (2010-11)

Piston Volume

0cc (2007-09), 3cc (2010-11)

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

Years

2007-09

2010-11

Part Number

12593207

12625436

Duration @ .050 in. (int./exh.)

193°/193°

196°/201°

Valve Lift (int./exh.)

0.482 in./0.482 in.

0.481 in./0.481 in.

Lobe Separation

116°+2

Cam Gear Attachment

1-Bolt

Cam Gear Poles

4X

Active Fuel Management (AFM)

Yes

Variable Valve Timing (VVT)

No

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

12594512

12613411

Fuel Injector Flow

36 lb/hr @ 58 psi

36 lb/hr @ 58 psi

Flex Fuel Capable (E-85)

Yes

Fuel Injector Length (between O-rings)

2.500 in.

1.900 in.

Fuel Injector Connector

EV6 / USCAR

Computer

E38

Crankshaft Reluctor Ring

58X

Camshaft Sensor Location

Timing Cover

Oil Pan

Varies by Application

Oil Pump

High Volume (1.25 c.i./rev.)