Engine Guides / LS Engines

LY5 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More

The LY5 engine is a 5.3L Gen. IV iron-block engine used in GM trucks and SUVs between 2007 and 2009. For marketing purposes, it was also known as the Vortec 5300. The information listed here is for a stock LY5 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 LY5? ReadLY5 5.3L Engine Upgrade Guide: Expert Advice for LY5 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 specific guide is for the GM LY5 5.3L Vortec 5300.

You can find more LS engine spec guides and LS-related information here.

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

LY5 5.3L Vortec 5300 Engine Specs

LY5 Performance Specifications

Engine Ratings
Compression Ratio9.9:1
Horsepower Rating315-320 hp
Torque Rating338-340 ft./lbs.

LY5 Applications

VIN 8th DigitYearMakeModel
J2007-09ChevroletSuburban 1500
J2007-09GMCYukon, Yukon XL

LY5 Engine Blocks

LY5 Engine Block Specs
Casting Numbers12576177, 12576178, 1589779
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
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.

LY5 Rotating Assembly

LY5 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 Casting Number (last 3 digits)143
Crankshaft MaterialCast Iron
Crankshaft Casting Number (last 3 digits)216
Crankshaft Main Journal2.559 in.
Crankshaft Rod Journal2.100 in.
Reluctor Wheel58x

LY5 Cylinder Heads

LY5 Cylinder Head Specs
Casting Numbers799, 243
Combustion Chamber Volume65cc
Intake Port ShapeCathedral
Intake Runner Volume210cc
Exhaust Port ShapeD-Port
Exhaust Runner Volume75cc
Intake Valve Diameter2.000 in.
Exhaust Valve Diameter1.575 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

LY5 Camshaft Specifications

LY5 Camshaft Specifications
Duration @ .050 in. (int./exh.)196°/201°
Valve Lift (int./exh.)0.481 in./0.481 in.
Lobe Separation116°+2
Cam Gear Attachment1-Bolt
Cam Gear Poles4x
Active Fuel Management (AFM) Yes
Variable Valve Timing (VVT)No

LY5 Valvetrain

LY5 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 OffsetNone
Valve Spring StyleBeehive
Valve Spring ColorNatural
Valve Angle15 Degrees
Intake Valve MaterialSteel - Solid Stem
Intake Valve Dia.2.000 in.
Exhaust Valve MaterialSteel - Solid Stem
Exhaust Valve Dia.1.575 in.

Other Key LY5 Specs

Throttle Body, Fuel Injectors, Oil Pan Specs & More
Intake ManifoldTruck-Style
Throttle Body87mm, 4-bolt
Throttle ControlElectronic (Drive-by-Wire)
Fuel Injector Part Number12580681
Fuel Injector Flow29.6 lb./hr. @ 58 psi
Flex Fuel Capable (E-85)No
Fuel Injector Length (between O-Rings)1.900 in.
Fuel Injector ConnectorEV6
Crankshaft Reluctor Ring58x
Camshaft Sensor LocationFront mount, 4x on cam
Oil PanDeep rear sump
Oil PumpStandard flow (0.96 c.i. per rev.)

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: LY5 5.3L Engine Upgrade Guide: Expert Advice for LY5 Mods to Maximize Performance - OnAllCylinders

  2. Kevin Mclaurin says:

    I love 5.3L, would love to put one in my 1966 chevy impala. I have a 2000 Yukon with 268,000 miles on it.

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

  4. I just traded for a 2012 Colorado 3LT v8 ext cab 5.3. 18,700 mile.
    Orginal rubber but dry rot. Clean as a pen. I cant find out the exact about the engine looking for an engine cover which was missing. What a sleeper. No name, no badge, no nonsense vehicle. What a find, thank you Lord.

  5. What engine plant manufactures this engine?

  6. Hello there just wondering, I’m wanting to get a ly5 iron block as going turbo, will that block go out to a 4.00″ bore to fit ls7 heads.. Cheers

  7. Chip Foster says:

    I followed your recommendations to the letter adding a stage 2 cam, lay springs, delete kit, timing chain, but I cant find your recommendation for the one bolt cam sprocket to the three bolt sprocket. I believe I found the correct summit gm sprocket but I would like to hear your recommendation.

  8. TEXAS PICKUP.. Several questions Canada built, 2008 4X4 Silverado 5.3 engine, 140,000 miles complete rebuild. AFM/DOD ate itself, 3 to 4 quarts @ 2500 mile intervals…. New Build natural asperated: forged Callies crank stroke 3.900, bored 3.800, forged flat top valve relief pistons, delete AFM/DOD. Cam Kit: moly pushrods, matched LS7 lifters, matched dual valve springs w/upgrade keepers, Roller Custom Cam DUR@.050″ 210*/218* Lift .578/.587 LSA 114* 4A, Single roller timing kit, replace left valve cover and valley plate, motor mounts to heavy duty, Melling high volume oil pump. Trans 4l60E upgrade to 500 torque at wheels, FTI stall 2000 converter. Engine is internally balanced as per OEM.
    1.should the injectors be increased to 36 lb.?

    2.Should a different Harmonic dampener/balancer be used?

    New crank is keyed, OEM balancer/dampener will need keyed machined to fit, or because I’ve changed the stroke is there a need to go with a different Balancer/Dampener? Aim is 475 to 525HP. Heavy hauler Detroit locker axle upgrade 373 gear.

    My thoughts after endless research is 36-lb. injectors.
    Machine OEM Balancer/dampener..
    Would really like the advise and or any additional thoughts on design or build awareness advice.

  9. So I’m looking to swap my 2007 390k miles 5.3L eng. J with a 2009 5.3L eng. O. Will everything swap and connect even my computer E38?

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