LS Engines

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

 
L76 truck engine swap

(Image/YouTube – buddyholly1969)

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: Looking to upgrade your L76 truck engine? ReadL76 6.0L Engine Upgrade Guide: Expert Advice for L76 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 about the GM L76 truck 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 Truck Engine Specs

The L76 is a 6.0L, Gen. 4, aluminum small block engine used in both GM cars and trucks from 2007 to 2009. This article is dedicated specifically to the truck and SUV version of the L76 engine.

(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.)

For marketing purposes, the L76 truck engine was known as the Vortec Max.

The information listed below is for the stock engine.

L76 (Truck) Performance Specifications

Engine Ratings
Compression Ratio9.7:1
Horsepower Rating367 hp
Torque Rating375 ft./lbs.

L76 (Truck) Applications

VIN 8th DigitYearMakeModel
Y2007-09ChevroletSuburban 1500
Y2007-09GMCYukon XL
Y2007-09ChevroletAvalanche
Y2007-09ChevroletSilverado
Y2007-09GMCSierra

L76 (Truck) Engine Blocks

L76 (Truck) Block Specs
Casting Numbers12568952
MaterialAluminum
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 (Truck) Rotating Assembly

L76 (Truck) Rotating Assembly Specs
Piston MaterialHypereutectic Cast Aluminum Alloy
Piston StyleDished, with valve reliefs
Piston Volume+6.7cc
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 (Truck) Cylinder Heads

L76 (Truck) Cylinder Head Specs
Casting Numbers5364, 823
MaterialAluminum
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 (Truck) Cam Specifications

Applications2007-09
Camshaft Part Number12625439
Duration @ .050 in. (int./exh.)196°/208°
Valve Lift (int./exh.)0.466 in./0.478 in.
Lobe Separation116°
Cam Gear Attachment1-Bolt
Cam Gear Poles4x
Active Fuel Management (AFM) Yes
Variable Valve Timing (VVT)Yes

L76 (Truck) Valvetrain

L76 (Truck) 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 (Truck) Specs

Throttle Body, Fuel Injectors, Oil Pan Specs & More
Intake ManifoldTruck-Style
Throttle Body87mm, 4-bolt, silver blade
Throttle ControlElectronic (Drive-by-Wire)
Fuel Injector Part Number12580681
Fuel Injector Flow30 lb./hr. @ 58 psi
Flex Fuel Capable (E-85)No
Fuel Injector Length (between O-Rings)1.870 in.
Fuel Injector ConnectorEV6-USCAR
ComputerE38
Crankshaft Reluctor Ring58x
Camshaft Sensor LocationFront Timing Cover, 4x
Oil PanVaries By Model
Oil PumpHigh Volume (1.25 c.i. per rev. @ 30 psi)
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2 Comments

  1. Pingback: LS Engines 101: An Introductory Overview of the Gen III/IV LS Engine Family - OnAllCylinders

  2. Pingback: L76 Car Engine Upgrade Guide: Expert Advice for L76 Car Engine Mods to Maximize Performance - OnAllCylinders

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