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Product Summary

6.7 liters Engine Displacement, Distributor Included

  • Block: Seasoned 6.0L LQ9
  • Year Rang: 2001-2007
  • Bore/Stroke: 4.030” x 3.622”
  • Displacement (cu.in): 370
  • Crankshaft: OEM GM 24 tooth Reluctor wheel
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Key Specs

Engine Displacement6.7 liters
Compression Ratio10.0:1
Camshaft TypeHydraulic Roller
Cylinder Head MaterialAluminum
Carburetor IncludedNo
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ATK Engines HP21M Details

Engine Specifications:

  • HP: 430
  • TQ: 500
  • Block: Seasoned OE roller block 1993-1997
  • Bore/Stroke: 4.040 x 4.000
  • Displacement: 408
  • Crankshaft: Scat nodular iron internal balance
  • Rods: Scat 4340 forged I beam with ARP 8740 bolts
  • Pistons: Forged 10.1 compression
  • Rings: Moly
  • Camshaft: Hyd. Roller
  • Cam Specs: 220/224 @50 .512in/.512ex 112LSA
  • Timing Chain: Double roller
  • Cylinder Heads: Dart aluminum 58cc/170cc 2.02/1.60
  • Rocker Arms: Aluminum 1.6 roller rockers
  • Oil Pan: Front sump
  • Oil Pump: Melling high volume
  • Balancer: Internal balance
  • Flexplate/Flywheel: Internal balance 164 tooth
  • Intake Manifold: Edelbrock performer RPM dual plane #7181
  • Distributor: Pro billet (upgraded melonite gear)
  • Water Pump: Early RH inlet standard rotation

    Recommended Components:

  • Carburetor: Quick Fuel 780CFM vacuum secondary’s electric choke #HR-780
  • Fuel Pump: Holley mechanical 110GPH #12-289-11
  • Spark Plugs: Autolite #3923
  • Spark Plug Wires: 8mm

    Engine Info:

  • Oil: Conventional / Non Synthetic 10W30
  • Oil Filter: Wix or K and N per application
  • Timing: 34-36 Degrees
  • Spark Plug Gap: .035”
  • Firing Order: 13726548
  • Octane: 91+
  • Stall Converter: 2200-2500
  • Exhaust: 1 5/8 – 1 3/4 Headers

    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.

  • 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

    ATK Engines HP21M Specifications

    KEY SPECS
    MFG. Part #HP21M
    BrandATK Engines
    Engine Displacement6.7 liters
    Compression Ratio10.0:1
    Camshaft TypeHydraulic Roller
    Cylinder Head MaterialAluminum
    Carburetor IncludedNo
    Intake Manifold IncludedYes
    Distributor IncludedYes
    Valve Covers IncludedYes
    Engine BalanceInternal
    Cylinder Heads IncludedYes
    Rear Main Seal Style1-piece
    Throttle Body IncludedNo
    Oil Pan IncludedYes
    Timing Cover IncludedYes
    Water Pump IncludedYes
    Harmonic Balancer IncludedYes
    Flexplate IncludedYes
    Flywheel IncludedNo
    Air Cleaner IncludedNo
    Spark Plugs IncludedNo
    Spark Plug Wires IncludedNo
    Computer IncludedNo
    Wiring Harness IncludedNo
    GENERAL
    AssembledYes
    Material TypeCast Iron
    GTIN Code00653517260117
    Sold in QuantityEach
    Crate Engine FamilyFord Windsor
    Supercharger IncludedNo