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

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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

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