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L59

L59 Vortec 5.3L V8 "GEN III"

Vehicle Applications

  • 2002–2006 Chevrolet Tahoe
  • 2002–2006 Chevrolet Suburban 1500
  • 2002–2006 GMC Yukon
  • 2002–2006 GMC Yukon XL 1500
  • 2002–2007 Chevrolet Avalanche Z71
  • 2002–2007 Chevrolet Silverado 1500
  • 2002–2007 GMC Sierra 1500

Product Highlights

  • Gen III Iron Cylinder Block
  • Cathedral Port Aluminum Cylinder Heads
  • Drive By Wire (Electronic Throttle) *except some 2002 models without traction control
  • 24X Ignition Systems



L59 Engine Specs (VIN "Z")

The information listed here is for the stock engine.

Performance Specifications
Compression

Ratio		 9.5:1
Horsepower

Rating		 285-295 hp
Torque

Rating		 320-335 ft./lbs.

 

Application Information

VIN 8th Digit

Year

Make

Model

Z

2002-2006

Chevrolet

Tahoe

Suburban 1500

GMC

Yukon

Yukon XL 1500

2002-2007

Chevrolet

Avalanche Z71

Silverado 1500

GMC

Sierra 1500

 

Engine Block Specifications
Casting

Numbers

12567392, 12567393, 12551358
Material

Iron
Displacement

5.3L / 325 cid
Bore

Dia.

3.780 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 (1999-2003)

Bore 1/5 = 2.346, Bore 2/4 = 2.326, Bore 3 = 2.307 (2003-2007)
Cam-to-Crank

Centerline

4.914 in.

 

Rotating Assembly Specifications
Piston

Material

Hypereutectic Cast Aluminum Alloy
Piston

Style

Dished
Piston

Volume

+8cc
Wrist Pin

Dia. (2002-2004)

0.9447 in., 0.9448 in. (Pressed)
Wrist Pin

Dia. (2005-2007)

0.9429 in., 0.9431 in (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

 

Cylinder Head Specifications
Years

2002-2007
Casting

Numbers

862,706
Material

Aluminum
Combustion

Chamber Volume

61cc
Intake

Port Shape

Cathedral
Intake

Runner Volume

200cc
Exhaust

Port Shape

Oval
Exhaust

Runner Volume

70cc
Intake

Valve Diameter

1.890 in.
Exhaust

Valve Diameter

1.550 in.
Cylinder

Head Bolt

Style

Torque to Yield (TTY)
Cylinder

Head Bolt

Size (2002-2003)

(8) M11 x 2 x 155, (2) M11 x 2 x 100, (5) M8 x 1.25 x 45
Cylinder

Head Bolt Size (2004-2007)

(10) M11 x 2 x 100, (5) M8 x 1.25 x 45

 

Camshaft Specifications
Years

2002-2007
Duration

at .050 in

(int./exh)

191/190
Valve

Lift (int./exh)

0.457 in./0.466 in.
Lobe

Separation Angle

(in degrees)

114
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.

1.890 in.
Exhaust

Valve Material

Steel - Solid Stem
Exhaust

Valve Dia.

1.550 in.




Other Specifications
Intake

Manifold

Truck Style
Throttle

Control

Electronic (Drive-by-Wire), except some 2002 models without traction control
Fuel Injector Flow

33 lbs./hr. @ 50 psi, Return Style (2002-04)

36.6 lbs./hr. @ 58 psi, Returnless (2005-07)
Fuel

Injector Length (O-ring to O-ring)

2.500 in.
Fuel

Injector Connector

EV6-USCAR
Fuel

Rail

Plastic (2002-03), Stainless Steel (2004-07)
PCM

Warren
Crankshaft

Reluctor Ring

24x
Camshaft

Sensor

Rear Mount, 1x on Camshaft
Oil

Pan

Deep Rear Sump
Oil

Pump

Standard Volume



L59 Harnesses