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 Ratio9.1:1
Horsepower Rating556-580 hp @ 6,300 rpm
Torque Rating551-556 ft./lbs.

LSA Applications

VIN 8th DigitYearMakeModel
P2012-15ChevyCamaro ZL1
LSA Engine Block Specs
Block Part Number12623968
Material319-T7 aluminum
Casting Number12621766
Displacement6.2L / 376 c.i.d.
Bore Dia. 4.065 in.
Stroke3.622 in.
Deck Height9.240 in.
Bore Spacing4.400 in.
Thrust Bearing Location#3 Main
Main Cap Style6-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 SquirtersYes
Cam-to-Crank Centerline4.914 in.
LSA Rotating Assembly Specs
Piston MaterialCast aluminum alloy (with anti-friction coating and anodized top ring groove)
Piston StyleDished without valve reliefs
Piston Part Number19180413
Piston Volume+15cc
Wrist Pin Dia.
0.9431 in.
Connecting Rod Part Number.12604857
Connecting Rod MaterialSteel Powdered Metal
Connecting Rod Weight696g
Connecting Rod StyleI-Beam
Connecting Rod Length6.098 in.
Connecting Rod BoltsM9 x 1 x 40
Crankshaft MaterialForged Steel
Crankshaft Part Number12623968
Crankshaft Rear Flange8-bolt

Crankshaft Main Journal Dia.2.559 in.
Crankshaft Rod Journal Dia.2.100 in.
Reluctor Wheel58X
LSA Cylinder Head Specs
Casting Number4863
Material356-T6 Rotocast Aluminum
Combustion Chamber Volume69.8cc
Intake Port ShapeRectangle
Intake Runner Volume259cc
Exhaust Port ShapeD-port
Exhaust Runner Volume89cc
Valve Seat MaterialBrico 3010
Cylinder Head Bolt StyleTorque to Yield (TTY)
Cylinder Head Bolt Size(10) M11 x 2 x 100, (5) M8 x 1.25 x 45
Head Gasket Part Number12622033
Head Gasket Compressed Thickness0.055 in.
LSA Camshaft Specifications
Camshaft Part Number12623064
Duration @ .050 in. (int./exh.)198°/216°
Valve Lift (int./exh.)0.492 in./0.480 in.
Lobe Separation Angle122.5°
Cam Gear Attachment1-Bolt
Cam Gear Poles4X
Active Fuel ManagementNo
Variable Valve Timing (VVT)No
LSA Valvetrain Specs
Lifter StyleHydraulic Roller
Lifter Link StylePlastic Lifter Tray
Lifter Body Diameter0.842 in.
Pushrod Length7.325 in.
Pushrod Diameter0.3125 in.
Rocker Arm Mounting StylePedestal
Rocker Arm StyleDie-Cast, Roller Fulcrum
Rocker Ratio1.7
Rocker OffsetIntake Only
Valve Spring StyleBeehive
Valve Spring Seat Pressure90 lbs. @ 1.800 in.
Valve Spring Open Pressure295 lbs. @ 1.250 in.
Valve Spring ColorNatural
Valve Angle12 Degrees
Intake Valve MaterialStainless Steel, Hollow Stem
Intake Valve Dia.2.165 in.
Exhaust Valve MaterialStainless Steel, Solid Stem
Exhaust Valve Dia.1.590 in.
Timing Chain Part Number12646386
Timing Chain Guide StyleSpring Loaded Tensioner
LSA Supercharger Specifications
ModelCTS-VCamaro ZL1
Supercharger Part Number (Solid Coupler)1930363519303635
Supercharger Part Number (Spring-Loaded Coupler)12670278 12670278
Displacement 1.9L1.9L
Rotor Twist160 Degree160 Degree
Pulley Diameter3.000 in. upper / 7.800 in. lower3.000 in. upper / 7.800 in. lower
Lid Height Standard0.750 in. Taller
Intercooler BrickStandardLarge
Intercooler PumpStandardLarge

Other Key LSA Specs

Throttle Body, Fuel Injectors, Oil Pan Specs & More
Intake ManifoldCast Aluminum (with integrated intercooler)
Throttle Body87mm
Throttle Control Electronic (Drive-by-Wire)
Fuel Injector Part Number12598646
Fuel Injector Flow59 lbs./hr. @ 58 psi
Flex Fuel Capable (E-85)No
Fuel Injector Length (between O-Rings)1.5 in.
Fuel Injector ConnectorEV6 / USCAR
Camshaft Sensor LocationTiming Cover
Oiling SystemWet Sump
Oil PanRear Sump (with a bolt-on oil cooler)
Oil Pump
High Volume
Oil Pump Pressure1.25 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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