LT Engines

L84 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 L84 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 L84 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 when the engine is swapped into older vehicles.  With changes to the Brake Controller, the vacuum pump and lines are no longer required

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

As before, it has flex fuel capability.  It’s also a mild-hybrid with start/stop technology. 

Versus the previous L83 or the current L82, the L84 (new for 2019) replaces AFM with 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 one cylinder at a time. Because the system is torque based, it uses just the right amount of cylinders to meet demand with seamless transitions.

The information listed here is for a stock engine.

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

Chevy L84 Engine Specs

5.3L L84 engine dimensions (Image/GM Powertrain)

L84 Performance Specifications

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

L84 Application Information

YearMakeModel
2019-presentChevroletSilverado
2019-presentGMCSierra

L84 Engine Block Specs

L84 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.

L84 Rotating Assembly

L84 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

L84 Cylinder Heads

L84 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

L84 Camshafts

L84 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.

L84 Valvetrain

L84 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

L84 Specs

L84 Intake, Throttle Body, Fuel Injector Specs & More
Intake ManifoldTruck Style
Throttle Body80mm, 4-Bolt
Throttle ControlElectronic (Drive-by-Wire)
Fuel Injector P/N*--
Fuel Injector Flow*--
Flex Fuel Capable (E-85)Yes
Computer*--
Crankshaft Reluctor Ring58x
Camshaft Sensor LocationTiming Cover
Oil Pan
Varies by Application
Oil PumpVariable Displacement
*Specifications currently unavailable.
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One Comment

  1. Al Schrader says:

    This new engine is sweet, especially the quiet cast factory headers.

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