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L7

LM7 Vortec 5.3L V8 "GEN III"

Vehicle Applications

  • 1999–2007 Chevrolet Silverado 1500
  • 1999–2007 GMC Sierra 1500
  • 2000–2006 Chevrolet Tahoe
  • 2000–2006 Chevrolet Suburban 1500
  • 2000–2006 GMC Yukon 
  • 2000–2006 GMC Yukon XL 1500
  • 2002–2005 Cadillac Escalade
  • 2002–2006 Chevrolet Avalanche
  • 2003–2007 Chevrolet Express
  • 2003–2007 GMC Savana

Product Highlights

  • Gen III Iron Cylinder Block
  • Cathedral Port Aluminum Cylinder Heads
  • Drive By Cable (Mechanical Throttle) 1999-2002
  • Drive By Wire (Electronic Throttle) *phased in on most 2003+ models
  • 24X Ignition Systems



LM7 Engine Specs (VIN 'T")

The information listed here is for the stock engine.

Performance Specifications

Compression
Ratio
9.5:1
Horsepower
Rating
270-295 hp
Torque
Rating
315-335 ft.-lbs.

 

Application Information

VIN 8th Digit

Year

Make

Model

T

1999-2007

Chevrolet

Silverado 1500

GMC

Sierra 1500

1999-2006

Chevrolet

Tahoe

Suburban 1500

GMC

Yukon

Yukon XL 1500

2002-2005

Cadillac

Escalade (2WD)

2002-2006

Chevrolet

Avalanche

2003-2007

Chevrolet

Express

GMC

Savana

 

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. (1999-2004)

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

Flexplate Mounting Flange
(1999-2007)

0.857 in.

 

Cylinder Head Specifications

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 (1999-2003)

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

Cylinder Head Bolt Size
(2004-2006)

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

 

Camshaft Specifications

Years

1999

2000-2006

Duration
at .050 in (int./exh)

191/190

191/190

Valve
Lift (int./exh)

0.457 in./0.466 in.

0.457 in./0.466 in.

Lobe
Separation Angle (in degrees)

115.5

114

Cam
Gear Attachment

3-Bolt

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
Body

78mm, 3-Bolt

Throttle Control

All Cable Operated, 1999-2002

Drive-by-Wire *phased in on most 2003+ models

Fuel
Injector Flow

1999 = 21.8 lb/hr @ 58 psi

2000 = 24.8 lb/hr @ 58 psi

2001-07 = 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