LT Engines

L82 5.3L EcoTec3 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More

2019 5.3L V-8 DFM VVT DI (L84) for Chevrolet Silverado (Image/General Motors)

This is an engine specification guide for General Motors’ fifth-generation L82 engine that launched in 2018 for use in the Chevrolet Silverado 1500 and GMC Sierra 1500. It is commonly referred to as an EcoTec3 5.3L engine and replaces the L83.

Compared to its predecessor the L83, the L82 has a different valley cover, centered water pump location, and exhaust system. By centering the water pump, it allows Gen. 4 high-mount air-conditioning and power steering pumps to be added.

It continues to incorporate Variable Valve Timing (VVT). The engine also uses direct fuel injection technology, which shoots fuel directly into the combustion chamber instead of the intake runner.

The L82 continues to use Active Fuel Management (AFM).

Its close cousin the L84 (new for 2019) has the more advanced Dynamic Fuel Management (DFM) system. DFM has cylinder deactivation lifters on all eight cylinders rather than just four. DFM has 17 modes of operation and can run on as little as two cylinders at a time. DFM also allows for the use of start/stop technology.

The L84 also has flex fuel capability while the L82 does not. 

The information listed here is for a stock engine.

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

Chevy L82 Engine Specs

5.3L L82 engine dimensions (Image/GM Powertrain)

L82 Performance Specifications

Engine Ratings
Compression Ratio11:1
Horsepower Rating355 hp @ 5,600 rpm
Torque Rating383 ft.-lbs. @ 4,100 rpm

L82 Application Information


L82 Engine Block Specs

L82 Block Specs
Part Number12620290
Material319-T7 Aluminum
Displacement5.3L / 325 c.i.d.
Bore Dia. 3.780 in.
Stroke3.622 in.
Deck Height9.240 in.
Bore Spacing4.400 in.
Thrust Bearing Location#3 Main, 1/2 thrust
Main Cap Style6-Bolt
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.
Cam-to-Crank Centerline4.914 in.

L82 Rotating Assembly

L82 Rotating Assembly Specs
Piston MaterialHypereutectic Cast Aluminum Alloy
Piston StyleDomed (with reliefs for the exhaust valve and direct injector)
Piston Volume0cc (net)
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 Number12607475
Crankshaft MaterialCast Iron
Crankshaft Part Number (Wet Sump)12619781
Crankshaft Main Journal Dia.2.559 in.
Crankshaft Rod Journal Dia.2.100 in.
Reluctor Wheel58X
Harmonic BalancerIron

L82 Cylinder Heads

L82 Cylinder Head Specs
Casting Number12620214
Material319-T7 Aluminum
Combustion Chamber Volume57.6cc
Intake Port ShapeRectangle
Intake Runner Volume248cc
Exhaust Port ShapeFlat Oval
Exhaust Runner Volume102cc
Cylinder Head Bolt StyleTorque to Yield (TTY)
Cylinder Head Bolt Size(10) M12 x 1.75, M8 corner bolts

L82 Camshafts

L82 Cam Specs
Part Number12619823
Duration @ .050 in. (int./exh.)*--
Valve Lift (int./exh.)*--
Lobe Separation Angle*--
Cam Gear Attachment1-Bolt
Cam Gear Poles4X
Active Fuel Management (AFM)Yes
Variable Valve Timing (VVT)Yes
*Specifications currently unavailable.

L82 Valvetrain

L82 Valvetrain Specs
Lifter StyleHydraulic Roller
Lifter Link StylePlastic Lifter Tray
Lifter Body Diameter0.842 in.
Pushrod Dimensions7.85 in. (long) x 0.342 (dia.)
Rocker Arm Mounting StylePedestal
Rocker Arm StyleDie-Cast, Roller Fulcrum
Rocker Ratio1.8
Rocker OffsetNone
Valve Spring StyleBeehive
Valve Spring ColorNatural
Intake Valve Angle12.5° / Splayed 2.61°
Exhaust Valve Angle12.0° / Splayed 2.38°
Intake Valve MaterialSteel, Solid Stem
Intake Valve Dia.1.928 in.
Exhaust Valve MaterialSteel, Sold Stem
Exhaust Valve Dia.1.556 in.
Timing Chain Guide StyleSpring-Loaded Tensioner

L82 Specs

L82 Intake, Throttle Body, Fuel Injector Specs & More
Intake ManifoldTruck Style
Throttle Body80mm, 4-Bolt
Throttle ControlElectronic (Drive-by-Wire)
Fuel Injector P/N12684286
Fuel Injector Flow*--
Flex Fuel Capable (E-85)No
Crankshaft Reluctor Ring58x
Camshaft Sensor LocationTiming Cover
Oil Pan
Varies by Application
Oil PumpVariable Displacement
*Specifications currently unavailable.
Tags: , , , ,


  1. Daniel Wilson says:

    Although I’m not very knowledgeable when the topic is GM’s L82, 5.3 liter EcoTec3 engine as designed for Chevy truck applications, I do like the way Brian Nutter and Paul Spurlock of Summit Racing along with the OAC Staff provided details and technical specifications that are not normally included with engine articles.

    Having all of these technical specifications available is really beneficial when it comes to clearly understanding the details of an engine specific topic.

    When it comes to this particular engine, I’m not sure what, if anything, is especially important to the point of having a detailed description. It might respond well to conventional performance upgrades like those used for old school pushrod Engines but from what I understand, it’s a fairly recent GM design with the antiquated OHV design technology instead of the more desirable performance benefits offered by a modern OHC valve train. As I kinda hinted at earlier, I’m not a graduate of Mr. Goodwrench Tech so I welcome all constructive comments from the Bow tie brigade. Just keep in mind that ignorance really isn’t bliss so hit me with your best shot. Maybe others can benefit from my mistakes.

    In contrast, Ford currently has a newly designed V-8 featuring pushrod activated over head valves that’s designated as a truck engine, but has several design features related to durability and performance that are typically used for higher power levels in muscle cars. One such feature is the poly angle valve layout and highly efficient quench style combustion chambers similar to the former Pro Stock dominating Cleveland style heads.

    With Fords current generation of record setting double overhead cam, 32 valve V-8’s in displacements ranging from the popular 4.6 liter and up to the four digit horsepower level potential of the 5.4 liter Shelby Mustang V-8’s, it doesn’t seem logical to release a completely new OHV, cam in block V-8 engine design.

    However, after reading about the recent drag strip testing that Ford conducted using this new pushrod V-8 with minimal engine modifications and drag strip preparations, the quarter mile performance was actually quite impressive. If Ford decides to make performance parts available for this new “truck” engine, it will most certainly find its way into passenger cars and the aftermarket will jump at the chance to take this engine to the next level with a flood of high performance upgrades

    The GM biased performance world really doesn’t care about anything that I might have to share pertaining to Ford Engines, past or present that’s going to put them on the trailer early for the long ride home in defeat but the full story is available online if interested.

    The On All Cylinders Staff did a good job of presenting the facts of another in a long line of GM-LT based engines with the exception of the typo describing the “sold” exhaust valve stem material. Job well done… thanks Summit Racing and On All Cylinders !

    And the beat goes on….

    The full story is available online and very interesting, especially

  2. engine weight? none of these spec sheets have engine weights

  3. Wayne Carson says:

    Fellas, I have been obsessed with squeezing more HP out of my L82 Sierra Ltd, while keeping it dependable. I’ve quit. I love my truck and am very happy with it. Power and Dependability. No reason to touch it. THANK YOU!

    You have a guy named Esterline there? Best salesman you’ve ever had!

  4. retro fit l82 into 1956 continental mark II. you have any info on best headers and motor mounts to use

Leave a Reply

Your email address will not be published.


This site uses Akismet to reduce spam. Learn how your comment data is processed.