ATK Core Return Process
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NOTE:

• Core return can be any Chevy LS 6.0L engine

Engine Specifications

This engine was designed to be a performance upgrade for LS based vehicles or perfect for a swap in a hot rod. For optimal performance, you will need headers, chassis dyno tune, and 36 lb. injectors.

• Horsepower: 460 hp
• Torque: 470 lb.-ft.

Block Information:

• OE LQ4/6.0L Iron
• Bore/Stroke: 4.040 in. x 3.622 in.
• Balance: Internally
• Displacement: 6.0L

Rotating Assembly:

• Crankshaft: OE GM 24-tooth reluctor wheel
• Rods: OE powder metal 6.093 in. with stock bolts
• Compression Ratio: 9.5:1
• Pistons: Hypereutectic dish
• Rings: Moly

Camshaft Specs:

• Camshaft: Hydraulic roller
• Cam Specs: Custom performance grind
• Timing Chain: OE single roller

Cylinder Head Information:

• Cylinder Heads: OE aluminum
• Combustion Chamber: 71 cc
• Intake Runner: 210 cc
• Valve Size: 2.000 in. Intake / 1.550 in. Exhaust
• Rocker Arms: OE roller rockers 1.7 ratio

Oil Pump Information:

• Oil Pump: Melling standard volume

EFI Information

• FiTech Ultimate LS EFI induction system
  • Intake Manifold Fabricated from Aluminum Sheet Metal
  • 92 mm Throttle Body
  • Billet Fuel Rails with Crossover -6 AN
  • 36 lb. Fuel Injectors 
  • ECM and Harness with Self-Learn Tuning
  • Handheld Controller with Touch Screen
  • Fan Control Outputs for 2 Fans

 Engine Includes:

• Short Block
• Camshaft
• Timing Set
• Cylinder Heads
• Intake Manifold
• EFI ECM and Harness
• Oil Pump 
• Oil Pan
• NGK Spark Plugs
• Spark Plug Wires
• Ignition Coils

Recommended Components

• Balancer: Stock internal balance/per application
• Exhaust: 1 5/8 in. Headers
• Firing Order: 18726543
• Flexplate/Flywheel: Stock internal balance
• Fuel Pump: High-pressure EFI
• Fuel Octane: 91+
• Intake Manifold: Stock EFI intake
• Oil Weight: 5W30
• Spark Plug Gap: .035 in.
• Stall Converter: 1800+
• Water Pump: Per application

 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 or break-in oil or conventional (non-synthetic) 10w30 oil with zinc additive for the first 500 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. It is best to avoid long periods of idling during this period. Check the engine oil and coolant levels daily. 

Engines with flat tappet hydraulic cams only - Run the engine between 2,000 and 2,500 RPM's, with no-load on the engine for the first 30 minutes. Let the engine cool down completely and repeat the process 2-3 more times. Do not idle the engine for an extended period at this time, this is critical for breaking in the camshaft.

At 500 Miles change the engine oil and filter using conventional (non-synthetic) oil with a zinc additive. Check fuel and ignition settings, adjust valves (where applicable).  Drive the next 500 miles normally, without high RPM's (below 5000 RPM), hard use, or extended periods of high loading or long periods of idling.

Change the oil and oil filter again at 1,000 miles. Continue using conventional (non-synthetic) oils and zinc additive, until about 4,000 miles. At that point, you may run a quality 10w30 synthetic oil if you choose. Use of oil with zinc or a zinc additive for the life of your engine is recommended. 

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.

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