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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 Ddiscuss theB LQ 4 Engine Specs , Valvetrain, Performance, And Reviews.

GM trucks from 1999 to 2007 used the LQ4 6.0L L (Gen. 3.) smaller block engine. Marketing called this engine the Vortec 6000. The standard LQ4 engine specs are listed.

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.

In recent times, LS and Vortec engines have become extremely popular for Performance and Customization. They have the ability to produce a lot of Horsepower, and they also handle modifications Such as turbos, superchargers, intake Systems, cams, And Nitrous Oxide very well.

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.

LQ 4 Engine Specs

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.
0.9447 in., 0.9448 in.
(Press Fit)
Wrist Pin Dia.
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

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

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.

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