ATK LS01 Chevy LQ4 408CI Stroker Base Engine 600+HP



Lead Time: Estimated: 4 - 6 weeks


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This LQ4/408CI Stroker with LS3 Aluminum heads is making 600HP+. Expect big mid to upper end power, will have a noticeable idle. For optimal Performance you will need headers, chassis dyno tune and 36lb injectors. Your engine may not necessarily come with all components listed, but they are listed as our recommendations of parts to run for optimal performance.

Engine Specifications:
• HP: 600
• TQ: 550
• Block: Seasoned OE LQ4 6.0L iron
• Bore/Stroke: 4.030 x 4.000
• Displacement ( 408ci
• Crankshaft: Manley 4340 forged internally balanced 58 tooth reluctor
• Rods: Manley 4340 forged H beam with ARP 8740 bolts
• Pistons: Manley 2618 forged 10.3:1 compression
• Rings: Moly
• Camshaft: Hyd. Roller
• Cam Specs: 240/256@50 .625/.625 113LSA
• Timing Chain: Billet single roller
• Cylinder Heads: LS3 aluminum 68.4cc/260cc 2.16/1.59 stainless steel valves
• Rocker Arms: OE 1.7 ratio with bushing upgrade

Recommended Components:
• Oil Pump: Melling STD Volume high pressure
• Balancer: PowerBond #PB1480-SS SFI internally balanced
• Intake Manifold: Edelbrock victor Jr. #28457
• Carburetor: Quick Fuel 850cfm mechanical secondary’s #Q-850
• Spark Plugs: Autolite #104
• Spark Plug Wires: MSD #5574

Engine Info:
• Flexplate/Flywheel: Internally balanced
• Water Pump: Per application
• Oil: Conventional / Non Synthetic 10W40
• Oil Filter: Wix or K&N
• Timing Control: We recommend MSD #6014 with a baseline of: 10deg @ 0RPM, 20deg @ 500RPM, 26deg @ 1500RPM and 31deg @ 2500RPM-6500RPM.
• Spark Plug Gap: .040”
• Firing Order: 18726543
• Octane: 91+
• Stall Converter: 3000+
• Exhaust: 1 ¾” Headers

Notes: A PCV valve must be ran; please follow the valve cover instructions provided. You must also run an Air-Oil separator system such as the Moroso #85487 to capture the excess crankcase vapors LS engines are known for. If you are not running a MAP Sensor, the MAP timing option in the timing control box must be zeroed out all the way across. Failure to do so will allow the controller to add timing which can lead to detonation. You must also run some sort of a steam line kit that dumps to your water pump, radiator or radiator hose; we recommend a 4 corner setup like the Trick Flow #TFS-306SB601. This allows air pockets/hot spots to escape the heads and can also be used to purge out trapped air when filling the radiator for the first time.


Disclaimer: The parts listed are ATK’s recommendations of parts to be used to obtain our power figures listed. Power figures can vary based on parts used by the end user. It is the customer’s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts. . ATK reserves the right to substitute parts used in engines if necessary.


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