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L20

LY2 Vortec 4.8L V8 "GEN IV"

Vehicle Applications

  • 2008–2009 Chevrolet Express/GMC Savana
  • 2007–2009 Chevrolet Silverado
  • 2007–2009 Chevrolet Tahoe
  • 2007–2009 GMC Sierra
  • 2007–2009 GMC Yukon

Product Highlights

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

LY2 Engine Specs (VIN "C")

 The information listed here is for a stock engine.

Performance Specifications

Compression Ratio 9.1 : 1
Horsepower Rating 260-295 hp.
Torque Rating 295-305 ft./lbs.

 

Application Information

VIN 8th Digit

Year

Make

Model

C

2007-09

Chevrolet

Silverado

Tahoe

GMC

Sierra

Yukon

2008-09

Chevrolet

Express

GMC

Savana

 

Engine Block Specifications

Casting Numbers

12576177, 12576178, 1589779

Material

Iron

Displacement

4.8L / 293 c.i.d.

Bore Dia.

3.780 in.

Stroke

3.267 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 Diameter

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 Casting Number (last three digits)

121

Crankshaft Material

Cast Iron

Crankshaft Casting Number (last three digits)

482

Crankshaft Main Journal Dia.

2.559 in.

Crankshaft Rod Journal Dia.

2.100 in.

Reluctor Wheel

58X

 

Cylinder Head Specifications

Casting Numbers

799

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

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

191°/190°

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)

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.

 

Other Specifications

Intake Manifold

Truck-Style

Throttle Body

87mm, 4-bolt

Throttle Control

Electronic (Drive-by-Wire)

Fuel Injector P/N

12580681

Fuel Injector Flow

29.6 lb./hr. @ 58 psi

Flex Fuel Capable (E-85)

No

Fuel Injector Length (between O-rings)

1.900 in.

Fuel Injector Connector

EV6

PCM

E38

Crankshaft Reluctor Ring

58X

Camshaft Sensor

Front mount, 4X on cam

Oil Pan

Deep Rear Sump

Oil Pump

Standard Flow (0.96 c.i. per rev.)