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LS1

LS1 Vortec 5.7L V8 "GEN III"

Vehicle Applications

  • 1997–2004 Chevrolet Corvette 
  • 1998–2002 Chevrolet Camaro (Z28 / SS)
  • 1998–2002 Pontiac Firebird / Trans Am
  •  2004 Pontiac GTO

Product Highlights

  • Gen III Aluminum Cylinder Block
  • Cathedral Port Aluminum Cylinder Heads
  • Drve By Cable (Mechanical Throttle) 1998-2002 F-Body / 2004 GTO
  • Drive By Wire (Electronic Throttle) 1997-2004 Corvette
  • 24X Ignition Systems


LS1 Engine Specs (VIN "G")

The information listed here is for the stock engine.

Performance Specifications

Compression Ratio 10.2:1
Horsepower Rating 305-350 hp
Torque Rating 335-365 ft./lbs

 

Application Information

VIN 8th Digit

Year

Make

Model

G

1997-2004

Chevrolet

Corvette

1998-2002

Camaro (Z28 / SS)

Pontiac

Firebird / Trans Am

2004

GTO

 

Engine Block Specifications

Casting Numbers

12550592, 12559846, 12559090, 12560621, 12562174, 12560629, 12559378, 12559846, 12560626, 12561166, 12561168

Material

Aluminum - Semi Permanent Mold

Displacement

5.7L / 346 cid

Bore Dia.

3.898 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 Diameter

2.751 in.

Cam Housing Bore Diameter

Bore 1/5 = 2.326, Bore 2/4 = 2.317, Bore 3 = 2.307 (2002-2003 1st design)

Bore 1/5 = 2.346, Bore 2/4 = 2.326, Bore 3 = 2.307 (2004-2007 2nd design)

Cam-to-Crank Centerline

4.914 in.

 

Rotating Assembly Specifications

Piston Material

Hypereutectic Cast Aluminum Alloy M124

Piston Style

Flat Top

Piston Volume

0cc

Wrist Pin Dia. (1997-2004)

0.9449 in (Press Fit)

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/Flywheel Mounting Flange

0.857 in.

 

Cylinder Head Specifications

1997-1998 Casting Numbers with perimeter valve cover bolts

10215339, 12550592, 12558806

1999-2004 Casting Numbers with centered valve cover bolts

12559853, 12558805, 12560621, 12562174, 12564241

Material

Aluminum

Combustion Chamber Volume

67cc

Intake Port Shape

Cathedral

Intake Runner Volume

200cc

Exhaust Port Shape

Oval

Exhaust Runner Volume

70cc

Intake Valve Diameter

2.000 in.

Exhaust Valve Diameter

1.550 in.

Cylinder Head Bolt Style

Torque to Yield (TTY)

Cylinder Head Bolt Size (1997-2003)

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

Cylinder Head Bolt Size (2004)

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

 

Cam Specifications

Year

Model

Int. Duration @ .050

Exh. Duration @ .050

Int. Lift

Exh. Lift

Lobe Separation

1997-1999

Corvette

199

207

0.472

0.479

117

2000

198

209

0.500

0.500

115.5

2001-2004

196

208

0.467

0.479

116

1998-2000

Camaro & Firebird

198

209

0.498

0.497

119.5

2001-2002

196

208

0.467

0.479

116

 

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 Spring Pressure

70 lbs. Seat / 220 lbs. Open

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.

1.550 in.

 

Other Specifications

Intake Manifold

LS1

Throttle Body

78mm, 3-Bolt

Throttle Control

Corvette = Drive By Wire, F-Body / GTO = Cable Throttle

Fuel Injector Flow

1997-98 = 29.6 lb/hr @ 58 psi

1999-00 = 27.3 lb/hr @ 58 psi

2001-04 = 30 lb/hr @ 58 psi

Fuel Injector Length (between O-Rings)

2.500 in.

Fuel Injector Connector

EV1

PCM

Warren

Crankshaft Reluctor Ring

24x

Camshaft Sensor

Rear Mount, 1x on cam

Oil Pan

F-Body = Rear sump, GTO= Front sump, Corvette = Batwing Rear sump Pan

Oil Pump

Standard Volume