Engine Guides / LS Engines

L76 Car Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More

The L76—like its LS2 sibling—is a 6.0L, Gen. 4, aluminum small block engine that was used both in GM cars and trucks. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM).

The L76 was available in the Pontiac G8 GT from 2007-09. It was also used in some Australian Holden cars.

(NOTE: Don’t confuse the engine specs here with the L-76 5.4L small block which could be found in the C2 Sting Ray Corvette in 1964.)

The information listed below is for the stock L76 car 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.

[NOTE: The L76 appeared in both cars AND trucks, and there are some differences between the two. To read about the L76 truck engine specifically, check out L76 Truck Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More.]

The aftermarket is strong for LS swap engines. 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 about the GM L76 car engine. You can find our other LS engine spec guides and LS-related tech articles here.

(Summit Racing’s Paul Spurlock and Brian Nutter contributed to this article.)

GM L76 Car Engine Specs

L76 (Car) Performance Specifications

Engine Ratings
Compression Ratio10.4:1
Horsepower Rating355 hp
Torque Rating384 ft./lbs.

L76 (Car) Applications

VIN 8th DigitYearMakeModel
Y2007-09PontiacG8 GT
N/A2006HoldenCommodore VZ Series II
N/A2009-10HoldenCommodore VE Series I
Note: The Australian vehicles use a different format for Vehicle Identification Numbers (VIN). The 8th digit is NOT the engine code in an Australian VIN code.

L76 (Car) Engine Blocks

L76 (Car) Block Specs
Casting Numbers12568952
Displacement6.0L / 364 c.i.d.
Bore Dia. 4.000 in.
Stroke3.622 in.
Deck Height9.240 in.
Bore Spacing4.400 in.
Thrust Bearing Location#3 Main
Main Cap Style6-Bolt
Main Housing Bore Dia.2.751 in.
Cam Housing Bore Dia.Bore 1/5 = 2.346, Bore 2/4 = 2.326, Bore 3 = 2.307
Cam-to-Crank Centerline4.914 in.

L76 (Car) Rotating Assembly

L76 (Car) Rotating Assembly Specs
Piston MaterialHypereutectic Cast Aluminum Alloy
Piston StyleFlat Top
Piston Volume0cc
Wrist Pin Dia.0.9431 in. (full floating)
Connecting Rod MaterialPowdered Metal
Connecting Rod StyleI-Beam
Connecting Rod Length6.098 in.
Connecting Rod Housing Bore2.225 in.
Connecting Rod BoltsM9 x 1 x 43
Connecting Rod Part Number12649190
Crankshaft MaterialCast Iron
Crankshaft Part Number12588613
Crankshaft Main Journal2.559 in.
Crankshaft Rod Journal2.100 in.
Reluctor Wheel58x

L76 (Car) Cylinder Heads

L76 (Car) Cylinder Head Specs
Casting Numbers5364, 823
Combustion Chamber Volume70cc
Intake Port ShapeRectangle
Intake Runner Volume257cc
Exhaust Port ShapeD-Port
Exhaust Runner Volume87cc
Intake Valve Diameter2.165 in.
Exhaust Valve Diameter1.590 in.
Cylinder Head Bolt StyleTorque to Yield (TTY)
Cylinder Head Bolt Size(10) M11 x 2 x 100, (5) M8 x 1.25 x 45

L76 (Car) Camshaft

L76 (Car) Cam Specifications
Camshaft Part Number12625439
Duration @ .050 in. (int./exh.)196°/208°
Valve Lift (int./exh.)0.478 in./0.466 in.
Lobe Separation116°
Cam Gear Attachment1-Bolt
Cam Gear Poles4x
Active Fuel Management (AFM)Yes, on the Pontiac G8 GT and the 2009-10 Commodore with an automatic transmission
Active Fuel Management (AFM)No, on the 2006 Commodore and the 2009-10 Commodore with a manual transmission
Variable Valve Timing (VVT)No

L76 (Car) Valvetrain

L76 (Car) Valvetrain Specs
Lifter StyleHydraulic Roller
Lifter Link StylePlastic Lifter Tray
Lifter Body Diameter0.842 in.
Pushrod Length7.385 in.
Rocker Arm Mounting StylePedestal
Rocker Arm StyleDie-Cast, Roller Fulcrum
Rocker Ratio1.7
Rocker OffsetOffset Intake
Valve Spring StyleBeehive
Valve Spring ColorNatural
Valve Angle15 Degrees
Intake Valve MaterialSteel - Solid Stem
Intake Valve Dia.2.165 in.
Exhaust Valve MaterialSteel - Solid Stem
Exhaust Valve Dia.1.590 in.

Other Key L76 (Car) Specs

Throttle Body, Fuel Injectors, Oil Pan Specs & More
Intake ManifoldCar-Style
Throttle Body90mm, 4-bolt
Throttle ControlElectronic (Drive-by-Wire)
Fuel Injector Part Number12576341
Fuel Injector Flow42 lb./hr. @ 58 psi
Flex Fuel Capable (E-85)No
Fuel Injector Length (between O-Rings)1.500 in.
Fuel Injector ConnectorEV6-USCAR
Crankshaft Reluctor Ring58x
Camshaft Sensor LocationFront Timing Cover, 4x
Oil PanVaries By Model
Oil PumpHigh Volume (1.26 c.i. per rev. @ 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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  1. Pingback: OnAllCylinders – LFA 6.0L Engine Upgrade Guide: Expert Advice for LFA Engine Mods to Maximize Performance

  2. No such thing as a 2007 Pontiac G8. Only the 2008 and 2009 model years exist. Good article otherwise.

  3. Joseph Moore says:

    I noticed this article did not mention (DOD) displacement on demand. Also I saw other articles advertising 361 h.p. But other than that, I found this info very good.

    • It said AFM above. Same thing. 361hp was the 08 model

      • Along with 08, was not the 09.1 still rated at 361?
        I was under the impression the hp droped with the 09.5 when the extra cats were added

      • Pretty sure the drop in hp from 361 to 355 was due to the recalibration for regular unleaded gas. I believe the 08 was tuned for premium gas. GM had to make changes since the gas prices were spiking all over the world in 09 and they had a hard time selling V8 sedans.

  4. Pingback: L76 6.0L Car Engine Upgrade Guide: Expert Advice for L76 Car Engine Mods to Maximize Performance

  5. Paul Couzner says:

    I own one of the Australian Cars with a LS2 – L76 in a HSV VZ 2006 Clubsport HRT Edition No 21 of 50 Made.. hear the Dyno from installing a OTR to a 115mm Intake system that was standard for this Car = 266KW or 357Hp @ 5,500Rpm = 530Nm tongue @ 4,500Rpm, Max Rpm is 8,500 before start of drop off.. It has to be run on min of 95 Unleaded petrol, Average under 10L Per 100Kms in highway & a round 14L per 100Kms in city. it has a M12 6 speed gearbox with a twin plate ceramic clutch.. 0 to 100Kms in 3.2 seconds, 0 to 250Kms in 11.8 seconds but that might be me as with T/C off it takes a couple of seconds to to gather the 3rd gear step @ 170 to 180Kms when max torque kicks in.. Have got 200Mph out of 5th Gear & still what to know what 6th gear will do..

    • Paul Couzner says:

      Love to know what would be a good upgrade for it??? looking @ going to a 3″ exhaust for a 2 1/2″ system and playing with the idea of going a Harrop Stealth Supper Charger (HTV2300) putting out 500Kw / @ 5,500Rpm with 8 psi boost.. so i can keep the Throttle response it has with out having to redo cams or heads for better flow.. In the big picture it as still a daily driver for Me… A 175Kw @ 800Rpm takes some getting used to for the normal person..

  6. Madam Pterodactyl says:

    Pontiac G8 was only available in a 2008 and 2009 year model in the USA. Production for this vehicle began Dec. of 2007 and sales began January 2008. Prior to that it was a Holden Commodore in Australia. Thank you-

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