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 engine specs and information listed below is for the stock L76 truck 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: Looking to upgrade your L76 truck engine? Read: L76 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[table “281nbspresponsivescroll” not found /]
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L76 (Truck) Cylinder Heads
|L76 (Truck) Cylinder Head Specs|
|Casting Numbers||5364, 823|
|Combustion Chamber Volume||70cc|
|Intake Port Shape||Rectangle|
|Intake Runner Volume||257cc|
|Exhaust Port Shape||D-Port|
|Exhaust Runner Volume||87cc|
|Intake Valve Diameter||2.165 in.|
|Exhaust Valve Diameter||1.590 in.|
|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|
L76 (Truck) Cam Specifications
|Camshaft Part Number||12625439|
|Duration @ .050 in. (int./exh.)||196°/208°|
|Valve Lift (int./exh.)||0.466 in./0.478 in.|
|Cam Gear Attachment||1-Bolt|
|Cam Gear Poles||4x|
|Active Fuel Management (AFM)||Yes|
|Variable Valve Timing (VVT)||Yes|
L76 (Truck) Valvetrain
|L76 (Truck) Valvetrain Specs|
|Lifter Style||Hydraulic Roller|
|Lifter Link Style||Plastic Lifter Tray|
|Lifter Body Diameter||0.842 in.|
|Pushrod Length||7.385 in.|
|Rocker Arm Mounting Style||Pedestal|
|Rocker Arm Style||Die-Cast, Roller Fulcrum|
|Rocker Offset||Offset Intake|
|Valve Spring Style||Beehive|
|Valve Spring Color||Natural|
|Valve Angle||15 Degrees|
|Intake Valve Material||Steel - Solid Stem|
|Intake Valve Dia.||2.165 in.|
|Exhaust Valve Material||Steel - Solid Stem|
|Exhaust Valve Dia.||1.590 in.|
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.