High Performance Crate Engine GM LS 6.0L 550HP / 490TQ

Name: High Performance Crate Engine GM LS 6.0L 550HP / 490TQ
Brand: ATK ENGINES
SKU: 059-LQ4-LB-1
Price: 8023.38 USD
Availability: InStock

^$8,023³⁸

Core Charge: ^$560⁰⁰

Truck Freight

Ships on 11/06/2026

Lowest Price Guarantee

High Performance Crate Engine

GM LS 6.0L

550HP / 490TQ

Seasoned LQ4/ Gen III Block

Base Engine

ATK Core Return Process
JEGS and ATK appreciate your business and want to ensure that your core return is as smooth as possible.

Please CLICK HERE for ATK Core Return Process

NOTE:

Core return can be any Chevy LS 6.0L engine

Engine Info

Exhaust: 1-5/8" Headers
Firing Order: 18726543
Octane: 91+
Oil: 10W30
Oil Filter: Wix or K&N
Spark Plug Gap: .040"
Stall Converter: 2500
Timing: Set to factory specifications via PCM module (Tune Required)

Recommended Components

Balancer: Stock internal balance/per application
Intake Manifold: Stock EFI, aftermarket EFI, or carbureted intake
Flexplate/Flywheel: Stock internal balance
Fuel Pump: Electric per application
Fuel Injectors: 36lb injectors
Spark Plugs: NGK #739-TR5GP
Spark Plug Wires: Factory
Water Pump: Per application

Notes: This engine can replace the 1999-2007 Chevy 5.3L LM7 engine with supporting modifications or any other factory LS equipped vehicle. It can also be retrofitted for an aftermarket EFI/Carb setup. ECM must be tuned, not doing so can damage the engine.

Disclaimer: Power figures can vary based on parts used by the end user. Some modifications to the vehicle may be required using these and or other aftermarket parts.

Engine Break-In Procedure

Use conventional or break-in oil (non-synthetic) for the first 600 miles of operation. Do not drive for long periods at any single speed, always vary your speed. Do not tow a trailer or put other heavy loads on the vehicle. Check the engine oil and coolant levels daily.

At 600 Miles change the engine oil and filter using conventional (non-synthetic) oil. Check fuel and ignition settings; adjust valves (where applicable).

After the first 5,000 of service synthetic engine oil may be used. Follow your vehicle owner’s manual for service intervals.

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

Please CLICK HERE for ATK Warranty

In 2007, ATK launched a High Performance Division with one of the finest engine shops in the country. By reverse engineering all of their engines, they are able to eliminate any OEM deficiencies. This makes an ATK built crate engine have a superior design over the original engine by incorporating better components when needed. These quality built engines are offered in three different stages for ease of finishing an engine swap. ATK HP engines feature a 24 month/unlimited mile warranty.

Engine Specifications

This is an LQ4 based engine with LS3 aluminum heads making a very street able 550hp. Expect big mid to upper power, will have a noticeable idle. For optimal performance you will need headers, chassis dyno tune, and upgraded injectors.

Horsepower: 550 hp
Torque: 490 lb/ft

Block Information: