L9H 6.2L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More

 

L9H engine 6.2L

(Image/eBay)

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.

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 L9H 6.2L Vortec 6200.

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.)

L9H 6.2L Vortec 6200 Engine Specs

The L9H is a 6.2L, Gen. 4, small block engine used in GM luxury trucks and SUVs between 2009 and 2013. For marketing purposes, it was also known as the Vortec 6200. The information listed here is for a stock engine.

L9H Performance Specifications

Engine Ratings
Compression Ratio 10.5:1
Horsepower Rating 403 hp
Torque Rating 417 ft./lbs.

L9H Applications

VIN 8th Digit Year Make Model
2 2009 Cadillac Escalade ESV, EXT
2 2009 Chevrolet Tahoe LTZ
2 2009 GMC Yukon Denali
2 2009-13 GMC Yukon XL 1500 SLT
2 2009-13 GMC Sierra 1500 Denali, SLE, SLT
2 2010-13 Chevrolet Silverado 1500 LT, LTZ

L9H Engine Blocks

L9H Block Specs
Casting Number 12584724
Material Aluminum
Displacement 6.2L / 376 c.i.d.
Bore Dia. 4.065 in.
Stroke 3.622 in.
Deck Height 9.240 in.
Bore Spacing 4.400 in.
Thrust Bearing Location #3 Main
Main Cap Style 6-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 Centerline 4.914 in.

L9H Rotating Assembly

L9H Rotating Assembly Specs
Piston Material Hypereutectic Cast Aluminum Alloy
Piston Style Flat Top with Valve Reliefs
Piston Volume +3cc
Wrist Pin Dia. 0.9431 in. (full floating)
Connecting Rod Material Powdered Metal
Connecting Rod Style I-Beam
Connecting Rod Length 6.098 in.
Connecting Rod Housing Bore 2.225 in.
Connecting Rod Bolts M9 x 1 x 43
Connecting Rod Part Number 12649190
Crankshaft Material Cast Iron
Crankshaft Part Number 12588613
Crankshaft Main Journal 2.559 in.
Crankshaft Rod Journal 2.100 in.
Reluctor Wheel 58x

L9H Cylinder Heads

L9H Cylinder Head Specs
Casting Numbers 5364, 823
Material Aluminum
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

L9H Cam Specifications

L9H Camshaft Specs
Camshaft Part Number 12623065
Duration @ .050 in. (int./exh.) 198°/209°
Valve Lift (int./exh.) 0.500 in./.500 in.
Lobe Separation 115°
Cam Gear Attachment 1-Bolt
Cam Gear Poles 4x
Active Fuel Management (AFM) No
Variable Valve Timing (VVT) Yes

L9H Valvetrain

L9H 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 Ratio 1.7
Rocker Offset Intake Rocker
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.

Other Key L9H Specs

Throttle Body, Fuel Injectors, Oil Pan Specs & More
Intake Manifold Truck-style
Throttle Body 87mm, 4-bolt
Throttle Control Electronic (drive-by-wire)
Fuel Injector Part Number 12609749
Fuel Injector Flow 54 lbs./hr. at 58 psi
Flex Fuel Capable (E-85) Yes
Fuel Injector Length (between O-Rings) 1.500 in.
Fuel Injector Connector EV6-USCAR
PCM E38
Crankshaft Reluctor Ring 58x
Camshaft Sensor Front mount, 4x on cam
Oil Pan Sump Location Deep rear sump
Oil Pump High volume (1.25 c.i. per rev. @ 33 psi)
Original author: OnAllCylinders Staff
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