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LS1


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



LS1 Harnesses