The LSA is a supercharged, Gen. 4, 6.2L, aluminum block engine. The engine specs and information listed here is for a stock LSA engine.
Mechanically similar, General Motors’ LS and LS-based Vortec engines wound up on almost every branch of the GM family tree: Chevy, Pontiac, GMC, Cadillac, Buick—heck, even Saab, Hummer, and Isuzu got some LS love.
Since LS and Vortec engines are so common, they’ve become the go-to performance and swap engines of the modern era.
These motors are capable of making a lot of horsepower, and respond well to upgrades like turbos, superchargers, high-flow cylinder heads, intake systems, cams, and nitrous oxide.
[Looking to upgrade your LSA engine? Check out LSA Engine Upgrade Guide: Expert Advice for LSA Mods to Maximize Performance.]
The aftermarket is strong, crate engines are available, and used motors are often cheaply sourced through junkyards.
Summit Racing has created a series of comprehensive guides for each engine in the LS family, so engine builders and tuners can have a handy reference for their projects.
This guide is specifically for the GM LSA engine.
You can explore all of our LS engine spec guides and LS tech resources here.
(Summit Racing’s Brian Nutter and Paul Spurlock contributed to this article.)
Chevy LSA Engine Specs
| LSA Performance Specifications | |
|---|---|
| Compression Ratio | 9.1:1 |
| Horsepower Rating | 556-580 hp @ 6,300 rpm |
| Torque Rating | 551-556 ft./lbs. |
LSA Applications
| VIN 8th Digit | Year | Make | Model |
|---|---|---|---|
| P | 2009-15 | Cadillac | CTS-V |
| P | 2012-15 | Chevy | Camaro ZL1 |
| LSA Engine Block Specs | |
|---|---|
| Block Part Number | 12623968 |
| Material | 319-T7 aluminum |
| Casting Number | 12621766 |
| Displacement | 6.2L / 376 c.i.d. |
| Bore Dia. | 4.065 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, Nodular Iron |
| 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. |
| Piston Oil Squirters | Yes |
| Cam-to-Crank Centerline | 4.914 in. |
| LSA Rotating Assembly Specs | |
|---|---|
| Piston Material | Cast aluminum alloy (with anti-friction coating and anodized top ring groove) |
| Piston Style | Dished without valve reliefs |
| Piston Part Number | 19180413 |
| Piston Volume | +15cc |
| Wrist Pin Dia. | 0.9431 in. |
| Connecting Rod Part Number. | 12604857 |
| Connecting Rod Material | Steel Powdered Metal |
| Connecting Rod Weight | 696g |
| Connecting Rod Style | I-Beam |
| Connecting Rod Length | 6.098 in. |
| Connecting Rod Bolts | M9 x 1 x 40 |
| Crankshaft Material | Forged Steel |
| Crankshaft Part Number | 12623968 |
| Crankshaft Rear Flange | 8-bolt |
| Crankshaft Main Journal Dia. | 2.559 in. |
| Crankshaft Rod Journal Dia. | 2.100 in. |
| Reluctor Wheel | 58X |
| LSA Cylinder Head Specs | |
|---|---|
| Casting Number | 4863 |
| Material | 356-T6 Rotocast Aluminum |
| Combustion Chamber Volume | 69.8cc |
| Intake Port Shape | Rectangle |
| Intake Runner Volume | 259cc |
| Exhaust Port Shape | D-port |
| Exhaust Runner Volume | 89cc |
| Valve Seat Material | Brico 3010 |
| 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 |
| Head Gasket Part Number | 12622033 |
| Head Gasket Compressed Thickness | 0.055 in. |
| LSA Camshaft Specifications | |
|---|---|
| Camshaft Part Number | 12623064 |
| Duration @ .050 in. (int./exh.) | 198°/216° |
| Valve Lift (int./exh.) | 0.492 in./0.480 in. |
| Lobe Separation Angle | 122.5° |
| Cam Gear Attachment | 1-Bolt |
| Cam Gear Poles | 4X |
| Active Fuel Management | No |
| Variable Valve Timing (VVT) | No |
| LSA Valvetrain Specs | |
|---|---|
| Lifter Style | Hydraulic Roller |
| Lifter Link Style | Plastic Lifter Tray |
| Lifter Body Diameter | 0.842 in. |
| Pushrod Length | 7.325 in. |
| Pushrod Diameter | 0.3125 in. |
| Rocker Arm Mounting Style | Pedestal |
| Rocker Arm Style | Die-Cast, Roller Fulcrum |
| Rocker Ratio | 1.7 |
| Rocker Offset | Intake Only |
| Valve Spring Style | Beehive |
| Valve Spring Seat Pressure | 90 lbs. @ 1.800 in. |
| Valve Spring Open Pressure | 295 lbs. @ 1.250 in. |
| Valve Spring Color | Natural |
| Valve Angle | 12 Degrees |
| Intake Valve Material | Stainless Steel, Hollow Stem |
| Intake Valve Dia. | 2.165 in. |
| Exhaust Valve Material | Stainless Steel, Solid Stem |
| Exhaust Valve Dia. | 1.590 in. |
| Timing Chain Part Number | 12646386 |
| Timing Chain Guide Style | Spring Loaded Tensioner |
| LSA Supercharger Specifications | ||
|---|---|---|
| Model | CTS-V | Camaro ZL1 |
| Supercharger Part Number (Solid Coupler) | 19303635 | 19303635 |
| Supercharger Part Number (Spring-Loaded Coupler) | 12670278 | 12670278 |
| Displacement | 1.9L | 1.9L |
| Rotor Twist | 160 Degree | 160 Degree |
| Pulley Diameter | 3.000 in. upper / 7.800 in. lower | 3.000 in. upper / 7.800 in. lower |
| Lid Height | Standard | 0.750 in. Taller |
| Intercooler Brick | Standard | Large |
| Intercooler Pump | Standard | Large |
Other Key LSA Specs
| Throttle Body, Fuel Injectors, Oil Pan Specs & More | |
|---|---|
| Intake Manifold | Cast Aluminum (with integrated intercooler) |
| Throttle Body | 87mm |
| Throttle Control | Electronic (Drive-by-Wire) |
| Fuel Injector Part Number | 12598646 |
| Fuel Injector Flow | 59 lbs./hr. @ 58 psi |
| Flex Fuel Capable (E-85) | No |
| Fuel Injector Length (between O-Rings) | 1.5 in. |
| Fuel Injector Connector | EV6 / USCAR |
| Camshaft Sensor Location | Timing Cover |
| Oiling System | Wet Sump |
| Oil Pan | Rear Sump (with a bolt-on oil cooler) |
| Oil Pump | High Volume |
| Oil Pump Pressure | 1.25 c.i./revolution, 33 psi |
…
NOTE: You can find engine specs and detailed engine upgrade advice for every LS and LS-based Vortec truck engine in one place: The Definitive Guide to LS Engine Specs and LS Engine Upgrades.
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