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LQ 9 Engine Specs
Here in this article you will learn about the LQ 9 Engine Specs, Performance, Cylinder Heads, Cam Specs & More, Let’s discuss the LQ 9 Engine Specs, Valvetrain+, performance, and Reviews.
General Motors vehicles from 2002–2007 were equipped with LQ9 6.0L Gen 3 small block engines.
It was marketed under various names, including the Vortec HO 6000 and the VortecMAX. This data applies to a factory standard engine.
The LS and Vortec engines developed by General Motors were used in various Chevrolet, Pontiac, GMC, Cadillac, Buick, and even Saab, Hummer, and Isuzu vehicles due to their mechanical similarity.
LS and Vortec motors are ubiquitous, making them the standard for performance and swap applications.
Turbos, superchargers, high-flow cylinder heads, intake systems, cams, and nitrous oxide are all effective ways to increase power in these engines.
There is a robust aftermarket, consumers can purchase crate engines, and secondhand machines can be purchased at low cost from local junkyards.
For the convenience of engine builders and tuners, Summit Racing has published a series of in-depth manuals covering each member of the LS family of engines.
The General Motors LQ9 engine is the focus of this particular manual.
LQ9 Block Specs |
|
|---|---|
| Material | Iron |
| Displacement | 6.0L / 364 c.i.d. |
| Bore Dia. | 4.000 in. |
| Stroke | 3.622 in. |
| Deck Height | 9.230 – 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. (2002-03) | Bore 1/5 = 2.326, Bore 2/4 = 2.317, Bore 3 = 2.307 |
| Cam Housing Bore Dia. (2003-07) | Bore 1/5 = 2.346, Bore 2/4 = 2.326, Bore 3 = 2.307 |
| Cam-to-Crank Centerline | 4.914 in. |
| Casting Numbers | 12551364, 12573581, 12577184 |
Engine Ratings |
|
|---|---|
| Compression Ratio | 10.1:1 |
| Horsepower Rating | 345 hp |
| Torque Rating | 380 ft./lbs. |
LQ9 Cylinder Head Specs |
|
|---|---|
| Casting Numbers | 035, 317 |
| Material | Aluminum |
| Combustion Chamber Volume | 71cc |
| Intake Port Shape | Cathedral |
| Intake Runner Volume | 210cc |
| Exhaust Port Shape | D-Port |
| Exhaust Runner Volume | 75cc |
| Intake Valve Diameter | 2.000 in. |
| Exhaust Valve Diameter | 1.550 in. |
| Cylinder Head Bolt Style | Torque to Yield (TTY) |
| Cylinder Head Bolt Size 2002-03 | (8) M11 x 2 x 155, (2) M11 x 2 x 100, (5) M8 x 1.25 x 45 |
| Cylinder Head Bolt Size 2004-07 | (10) M11 x 2 x 100, (5) M8 x 1.25 x 45 |
LQ9 Valvetrain Specs |
|
|---|---|
| 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 | None |
| Valve Spring Style | Beehive |
| Valve Spring Color | Natural |
| Valve Angle | 15 Degrees |
| Intake Valve Material | Steel – Solid Stem |
| Intake Valve Dia. | 2.000 in. |
| Exhaust Valve Material | Steel – Solid Stem |
| Exhaust Valve Dia. | 1.550 in. |
| Lifter Style | Hydraulic Roller |
| Lifter Link Style | Plastic Lifter Tray |
LQ9 Cam Specs |
|
|---|---|
| Part Number | 12561721 |
| Duration @ .050 in. (int./exh.) | 196/201 |
| Valve Lift (int./exh.) | 0.467 in./0.479 in. |
| Lobe Separation Angle | 116° |
| Cam Gear Attachment | 3-Bolt |
| VIN 8th Digit | Year | Make | Model |
|---|---|---|---|
| N | 2002-06 | Cadillac | Escalade |
| N | 2002-06 | Cadillac | Escalade EXT |
| N | 2002-06 | Cadillac | Escalade ESV |
| N | 2003-07 | Chevy | Silverado SS |
| N | 2004-06 | Chevy | Silverado HO Edition |
| N | 2004-06 | GMC | Sierra HO Edition |
| N | 2006-07 | Chevy | Silverado Classic VortecMAX |
| N | 2006-07 | GMC | Sierra 1500 Classic VortecMAX |
LQ9 Cylinder Head Specs |
|
|---|---|
| Casting Numbers | 035, 317 |
| Material | Aluminum |
| Combustion Chamber Volume | 71cc |
| Intake Port Shape | Cathedral |
| Intake Runner Volume | 210cc |
| Exhaust Port Shape | D-Port |
| Exhaust Runner Volume | 75cc |
| Intake Valve Diameter | 2.000 in. |
| Exhaust Valve Diameter | 1.550 in. |
| Cylinder Head Bolt Style | Torque to Yield (TTY) |
| Cylinder Head Bolt Size 2002-03 | (8) M11 x 2 x 155, (2) M11 x 2 x 100, (5) M8 x 1.25 x 45 |
| Cylinder Head Bolt Size 2004-07 | (10) M11 x 2 x 100, (5) M8 x 1.25 x 45 |
Oil Pan Specs & More |
|
|---|---|
| Intake Manifold | Truck Style |
| Throttle Body | 80mm, 3-Bolt |
| Throttle Control | Electronic, Drive-by-Wire |
| Fuel Injector Flow | 25.2 lbs./hr. |
| Fuel Injector Length (between O-Rings) | 1.9 in. |
| Fuel Injector Connector | EV6 |
| PCM | Warren |
| Crankshaft Reluctor Ring | 24x |
| Camshaft Sensor | Rear Mount, 1x on Cam |
| Oil Pan | Deep Rear Sump |
| Oil Pump | Standard Volume |
LQ 9 Engine Specs Review Video
LQ 9 Engine Specs FAQ
What cars did the LQ9 come in?
It was first seen in use as standard equipment on the 2002 Cadillac Escalade. Until 2007, it could be found on Cadillac Escalades and General Motors trucks.
Besides the Vortec HO 6000 and VortecMAX, the LQ9 was known as the Vortec HO.
What LS engine is the LQ9?
Chevrolet Performance LS364/450 6.0L LS Series Engine, also known as the LQ9 Crate Engine.
Is the LQ9 reliable?
They are featuring the Lowrider Garage 5.3 Engine Swap. The GM 5.3 LQ9 engine is getting increasingly popular among car enthusiasts, but you can still find them for a reasonable price.
Every day, the driver with these engines has clocked more than 200,000 miles without a problem.
Is the LQ9 an iron block?
Chevrolet Performance now offers a 6.0L LS cast iron engine block, allowing you to create the ultimate LS street performance.
The LQ4 and LQ9 Truck and SUV models with the 6.0L engine and no Active Fuel Management inspired this block.
With its renowned reliability, this block is ideal for street-legal LS supercharged and turbo power upgrades.
How big can you make an LQ9?
We are improving the Engine Block of the LQ4/LQ9. Displacement can never be replicated. Overbearing the cylinders by 0.030 in is safe.
With a stroke of 4.000 inches, the resulting removal will be 408 cubic inches (or 6.7 liters).
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