LS1 Engine Specs
Here in this article you will learn about the LS1 Engine Specs , Performance, Cylinder Heads, Cam Specs & More, Let’s discuss the LS1 Engine Specs , Valvetrain, performance, and Reviews.
The first engine listed is the first GM LS — the 5.7L LS1 that appeared in the 1997 Chevy Corvette.
The LS1 is the first Gen. 3 small block engine made by General Motors and used in cars between 1997 and 2004.
The LS1 engine specs and details below are for the original LS1 engine.
Mechanically similar, the GM LS and the LS Vortec engines ended up across the entire part of the GM family tree: Chevy, Pontiac, GMC, Cadillac, Buick–heck too! Saab, Hummer, and Isuzu received some LS affection.
As LS and Vortec engines have become so ubiquitous, they’ve been the most popular engines for swapping and performance in the present.
These motors are capable of producing a large amount of horsepower.
They also respond very well to upgrades, such as turbos, superchargers or turbos, high-flow intake systems, cylinder heads, cams, and nitrogen oxide.
The aftermarket is booming, crate engines are readily accessible, and used motors can be easily found in junkyards.
Summit Racing has created a series of detailed guides for every engine in the LS family of engines so that the builders and tuners of engines can find a guide to their projects.
LS1 Block Specs |
|
|---|---|
| Displacement | 5.7L / 346 c.i.d. |
| Material | Aluminum – Semi Permanent Mold |
| Bore Spacing | 4.400 in. |
| Bore Dia. | 3.898 in. |
| Stroke | 3.622 in. |
| Deck Height | 9.240 in. |
| Thrust Bearing Location | #3 Main |
| Main Cap Style | 6-Bolt |
| Main Housing Bore Dia. | 2.751 in. |
| Cam Housing Bore Dia. (2002-03) | Bore 1/5 = 2.326, Bore 2/4 = 2.317, Bore 3 = 2.307 |
| Cam Housing Bore Dia. (2004-07) | Bore 1/5 = 2.346, Bore 2/4 = 2.326, Bore 3 = 2.307 |
| Cam-to-Crank Centerline | 4.914 in. |
| Casting Numbers | 12550592, 12559846, 12559090, 12560621, 12562174, 12560629, 12559378, 12559846, 12560626, 12561166, 12561168 |
Engine Ratings |
|
|---|---|
| Torque Rating | 335-365 ft./lbs. |
| Horsepower Rating | 305-350 hp |
| Compression Ratio | 10.2:1 |
LS1 Applications
| VIN 8th Digit | Year | Make | Model |
|---|---|---|---|
| G | 1997-2004 | Chevy | Corvette |
| G | 1998-2002 | Chevy | Camaro (Z28 / SS) |
| G | 1998-2002 | Pontiac | Firebird / Trans Am |
| G | 2004 | Pontiac | GTO |
LS1 CylinderHead Specs |
|
|---|---|
| Intake Port Shape | Cathedral |
| 1999-2004 Casting Numbers (Center Valve Cover Bolts) | 12559853, 12558805, 12560621, 12562174, 12564241 |
| Material | Aluminum |
| Combustion Chamber Volume | 67cc |
| 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 |
| 1997-1998 Casting Numbers (Perimeter Valve Cover Bolts) | 10215339, 12550592, 12558806 |
LS1 Rotating Assembly Specs |
|
|---|---|
| Reluctor Wheel | 24x |
| 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. |
| Piston Style | Flat Top |
| Flexplate/Flywheel Mounting Flange | 0.857 in. |
| Piston Material | Hypereutectic Cast Aluminum Alloy M124 |
LS1 Valvetrain Specs |
|
|---|---|
| Exhaust Valve Material | Steel – Solid Stem |
| 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 |
| Lifter Link Style | Plastic Lifter Tray |
| Intake Valve Dia. | 2.000 in. |
| Exhaust Valve Material | Steel – Solid Stem |
| Exhaust Valve Dia. | 1.550 in. |
| Lifter Style | Hydraulic Roller |
LS1 Cam Spec
| Year | Model | Int. Duration @ .050 | Lobe Separation |
|---|---|---|---|
| 1997-99 | Corvette | 199 | 117 |
| 2000 | Corvette | 198 | 115.5 |
| 2001-04 | Corvette | 196 | 116 |
| 1998-2000 | Camaro Firebird | 198 | 119.5 |
| 2001-02 | Camaro Firebird | 196 | 116 |
| Exh. Duration @ .050 | Int. Lift | Exh. Lift |
|---|---|---|
| 207 | 0.472 | 0.479 |
| 209 | 0.500 | 0.500 |
| 208 | 0.467 | 0.479 |
| 209 | 0.498 | 0.497 |
| 208 | 0.467 | 0.479 |
Other Key LS1 Specs
| Throttle Body, Fuel Injectors, Oil Pan Specs & More | |
|---|---|
| PCM | Warren |
| Fuel Injector Flow, 2001-04 | 30 lbs. |
| Throttle Control, Corvette | Drive-by-Wire |
| Throttle Control, GTO, Camaro/Firebird | Throttle Cable |
| Fuel Injector Flow, 1997-98 | 29.6 lbs. |
| Fuel Injector Flow, 1999-2000 | 27.3 lbs. |
| Fuel Injector Length (between O-Rings) | 2.5 in. |
| Fuel Injector Connector | EV1 |
| Throttle Body | 78mm, 3-Bolt |
| Crankshaft Reluctor Ring | 24x |
| Camshaft Sensor | Rear Mount, 1x on cam |
| Oil Pan, Corvette | Batwing Rear Sump |
| Oil Pan, Camaro/Firebird | Rear Sump |
| Oil Pan, GTO | Front Sump |
| Oil Pump | Standard Volume |
| Intake Manifold | LS1 |
LS1 Engine Specs Review Video
LS1 Engine Specs FAQ
How much HP does an LS1 engine have?
At the beginning for beginning point, the LS1 was a revelation for Chevy enthusiasts.
Its aluminum-based design resulted in it being considerably lighter than previous GM V8s. The performance was outstanding.
It was valued at 345-350 horsepower on the Corvette (depending on the year of manufacture) and could be measured as high as 325 horses in the F-body models.
What engine size is a LS1?
Its LS1 ( 5.7 liters, 346ci) was the engine that sparked the entire. It was given its Gen III designation and introduced in 1997’s Corvette and the Firebird/Camaro models in 1998.
It was a significant contrast to the prior LT1 (Gen II) engine and featured features like an aluminum block with a deep skirt and close-to-plug ignition.
How much HP can a LS1 handle?
Even in emissions-legal trim, an LS1 that is blown will generate more than 500 horsepower on the wheel and 800 wheel horsepower for serious stroker efforts.
With turbo motors, there is no limit, as 1,000 horsepower is not uncommon, with the capability to modify the power output simply by turning a transparent boost knob.
Why are LS1 so good?
The LS engine has become known for its ability to be modified and easily altered.
For example, a new intake or exhaust system can provide a decent number of horses to your engine’s output.
A head/cam swapping alone can add 100 horsepower to the configuration.
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