$275 Shipping

ATK 408BOOSTLB Chevy LQ4 408CI Base Engine

$275 Shipping

ATK 408BOOSTLB Chevy LQ4 408CI Base Engine
ATK Engines

|

#35020045

ATK 408BOOSTLB Chevy LQ4 408CI Base Engine

  • Oil: Conventional / Non Synthetic 10W30
  • Oil Filter: Wix or K&N per application
  • Timing: 34-36 Degrees
See More

$7,900.00

/each

Factory Shipped


Quantity

Need Help? Call to Order

Add to a list

Share

Select a vehicle to verify Fitment

Select Vehicle

Product Summary

Long Block Crate Engine Type, 10.2:1 Compression Ratio

  • Oil: Conventional / Non Synthetic 10W30
  • Oil Filter: Wix or K&N per application
  • Timing: 34-36 Degrees
  • Spark Plug Gap: .035”
See more details

Key Specs

Crate Engine TypeLong Block
Engine Displacement6.7 liters
Compression Ratio10.2:1
Camshaft TypeHydraulic Roller
Cylinder Head MaterialAluminum
See more specs

Need To Know

Truck Shipment

Truck shipments must be pre-paid with a credit card, certified check or money order

Need help?

855.313.9176
View the Help Center

Quick and Easy Returns

Return Policy

ATK Engines 408BOOSTLB Details

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 (cu.in): 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.

    • CARB Warning

    Follow EPA, CARB, and state regulations for engine changes

    Emissions warning: this part is for vehicle engine changes, not direct oem engine replacements. In California, engine changes are legal when done in compliance with California bureau of automotive repairs (bar) engine change policy. For assistance, call bar referee at: (800) 622-7733. And see https://bar.Ca.Gov/consumer/smog_check_program/engine_changes. All customers must comply with federal epa mobile source enforcement memorandum no. 1a (and addendum) and all applicable state regulations when conducting engine changes. Improper installation and/or use of this part in California may subject the installer and/or owner to a $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and laws of all states for use of this engine change part on makes or models of vehicles that render them noncompliant with applicable state and/or federal emission laws with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine
    CA Prop 65
    CARB warning

    ATK Engines 408BOOSTLB Specifications

    KEY SPECS
    MFG. Part #408BOOSTLB
    BrandATK Engines
    Crate Engine TypeLong Block
    Engine Displacement6.7 liters
    Compression Ratio10.2:1
    Camshaft TypeHydraulic Roller
    Cylinder Head MaterialAluminum
    Carburetor IncludedNo
    Intake Manifold IncludedNo
    Distributor IncludedNo
    Valve Covers IncludedNo
    Engine BalanceInternal
    Cylinder Heads IncludedYes
    Rear Main Seal Style1-piece
    Throttle Body IncludedNo
    Oil Pan IncludedNo
    Timing Cover IncludedNo
    Water Pump IncludedNo
    Harmonic Balancer IncludedNo
    Flexplate IncludedNo
    Flywheel IncludedNo
    Air Cleaner IncludedNo
    Spark Plugs IncludedNo
    Spark Plug Wires IncludedNo
    Computer IncludedNo
    Wiring Harness IncludedNo
    GENERAL
    AssembledYes
    Material TypeCast Iron
    NotesEngine is designed to be used with turbo or supercharger applications up to a maximum of 15psi.
    Sold in QuantityEach
    Crate Engine FamilyChevy LS
    Supercharger IncludedNo

    Fitment

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    Customer Impersonation Script