LQ 4 Engine Specs
Here in this article you will learn about the LQ 4 Engine Specs, Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, Let’s discuss theB LQ 4 Engine Specs , Valvetrain, performance, and Reviews.
The LQ4 is a 6.0L L (Gen. 3.) smaller block engine utilized in GM trucks from 1999 to 2007. For marketing reasons, this engine was also known as the Vortec 6000. The specifications and information for the engine are for the standard LQ4 engine.
General Motors LS and LS-based Vortec engines were mechanically identical in all branches of the GM family tree: Chevy, Pontiac, GMC, Cadillac, Buick–heck too! Saab, Hummer, and Isuzu were able to get some LS affection.
Because LS and Vortec engines have become so popular, they’ve been the most popular engines for swapping and performance in the current era.
They are capable of producing lots of horsepowers. They also respond very well to upgrades, such as turbos, superchargers and intake systems, cams and Nitrous oxide.
The aftermarket is booming, crate engines are readily accessible, and used motors are usually easily found in junkyards.
Summit Racing has created a series of detailed guides for each engine within the LS family of engines so that the builders and tuners of engines have a guide to their projects.
This guide is specifically designed for this engine. GM LQ4 engine.
LQ4 Block Specs |
|
|---|---|
| Displacement | 6.0L / 364 c.i.d. |
| Main Cap Style | 6-Bolt |
| 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 Housing Bore Dia. | 2.751 in. |
| Cam Housing Bore Dia. (1999-2003) | 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 |
| Material | Iron |
LQ4 Rotating Assembly Specs |
|
|---|---|
| Piston Material | Hypereutectic Cast Aluminum Alloy |
| Piston Style | Dished |
| Piston Volume | + 6.7cc |
| Wrist Pin Dia. (1999-07) |
0.9447 in., 0.9448 in. (Press Fit) |
| Wrist Pin Dia. (2005-07) |
0.9429 in., 0.9431 in. (Full Floating) |
| Connecting Rod Material | Powdered Metal |
| Connecting Rod Style | I-Beam |
| Connecting Rod Length | 6.098 in. |
| Connecting Rod Bolts | M9 x 1 x 43 |
| Crankshaft Material | Cast Iron |
| Crankshaft Main Journal | 2.559 in. |
| Crankshaft Rod Journal | 2.100 in. |
| Reluctor Wheel | 24X |
| Flexplate/Flywheel Mounting Flange (1999-2000) | 1.250 in. |
| Flexplate/Flywheel Mounting Flange (2001-07) | 0.857 in. |
LQ4 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 | 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. |
LQ4 Cylinder Head Specs |
|
|---|---|
| Years | 1999-2000 |
| Material | Iron |
| Combustion Chamber Volume | 71cc |
| Intake Port Shape | Cathedral |
| Intake Runner Volume | 200cc |
| Exhaust Port Shape | Oval |
| Exhaust Runner Volume | 70cc |
| Intake Valve Diameter | 2.000 in. |
| Exhaust Valve Diameter | 1.550 in. |
| Cylinder Head Bolt Style | Torque to Yield (TTY) |
| Cylinder Head Bolt Size 1999-2003 | (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 |
| Casting Numbers | 373, 873 |
LQ4 Performance Specifications
| Engine Ratings | |
|---|---|
| Oil Pump | Standard Volume |
| Horsepower Rating | 300-330 hp |
| Torque Rating | 360-370 ft./lbs. |
Throttle Body, Fuel Injectors, Oil Pan Specs & More |
|
|---|---|
| Intake Manifold | Truck Style |
| Throttle Body | 80mm, 3-Bolt |
| Throttle Control (1999-02) | Cable-Operated |
| Throttle Control (2003-04) | Electronic, Drive-by-Wire (for most models) |
| Fuel Injector Flow | 24.8 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 |
| Compression Ratio | 9.4:1 |
Conclusion
Its LQ4 engine was first released in 1999. Some versions of the engine are still in use today.
The engine is famous for its power and excellent performance under heavy loads. However, it’s also renowned for its high consumption of fuel. In general, consumers are content with the durability and performance that this model provides.
LQ 4 Engine Specs FAQ
How much HP does the LQ4 have?
The two 6.0L iron-block engines on the market Are available, the LQ9 (345 horsepower) and the LQ4 ( 300-325 hp).
How do I get more power out of my LQ4?
Upgrade of the LQ4/LQ9 intake manifold and Throttle Body
Is the LQ4 an iron block?
The intake can be ported as a good option worth the cost.
If you’re looking for greater performance and torque, consider the Trailblazer S.S. intake is an upgrade and an extra 90mm 4 bolt throttle body can be installed.
The F.A.S.T. L.S.X.R.T. intake lets you have a greater throttle body with 102mm+.
Is a LQ4 a Vortec Max?
What is the difference between Vortec as well as Vortec M.A.X.? The normal 6.0L Vortec had LQ4 and LY6 engine codes, whereas the Vortec M.A.X. used the LQ9 engine code.
How much oil does a LQ4 take?
6 quarts
Can you stroke an LQ4 engine?
A single Engine Masters challenger creates an affordable 587hp 409 cubes LQ4 stroker that is ideal for the average person.
I am Dipak Salvi. I’ve been a blogger since 2010, and I love to write. I really like to write about cars, technology, and money. I also write about fitness and health. I run a lot of blogs, such as https://commercialvehicleinfo.com. You can contact me at [email protected]