ATK 408BOOSTLB Chevy LQ4 408CI Base Engine



Lead Time: Estimated: 4 - 6 weeks


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This engine was designed to be used with a Turbo or Supercharger up to 15psi. We designed this engine to be affordable yet strong enough to handle a good amount of boost!

Engine Specifications:
• HP: 550
• TQ: 535
• Block: GM 6.0L Iron LQ4 with ARP main studs
• Bore/Stroke: 4.030”x 4.000”
• Displacement ( 408
• Crankshaft: Manley 4.000″ Stroke Internally Balanced 24 tooth Reluctor wheel
• Rods: Manley 4340 Forged 6.125” H Beam with ARP 2000 Bolts
• Pistons: Forged
• Compression Ratio: 10.2:1
• Rings: Total Seal CS/AP With Steel Top Ring
• Camshaft: Hyd. roller
• Cam Specs: 226/230 @50 .600/.575 113LSA
• Cylinder Heads: ATK LS3 aluminum 68cc 2.165”/1.590” valves
• Rocker Arms: OE powdered metal 1.7 ratio with Trunnion Upgrade
• Oil Pump: Melling 10296 High Volume

Recommended Components:
• Oil- 10W30
• Oil Filter: Wix
• Fuel System – OE EFI System or Aftermarket
• Intake – Stock Fuel Injected or Aftermarket
• Balancer- Stock Internally Balanced
• Flex plate/Flywheel- Stock Internally Balanced
• Timing- Set to Factory Specifications Via PCM Module (Tune Required)
• Spark Plug: NGK BR7
• Tuning: Chassis dyno tune required
• Firing Order- Stock
• Fuel – 91+ Octane
• Recommended Stall Converter- 2800+ based on application
• Headers- 1 7/8”+ depending on application


Notes: This engine is designed for mild forced induction applications up to 15PSI.


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 for 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.