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Product Summary

6.7 liters Engine Displacement, Internal Engine Balance

  • Oil: Conventional / Non Synthetic 10W30
  • Oil Filter: Wix or K&N per application
  • Timing: 34-36 Degrees with vacuum port plugged on carburetor
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Key Specs

Engine Displacement6.7 liters
Piston MaterialForged Aluminum
Crankshaft MaterialForged 4340 Steel
Connecting Rod MaterialForged 4340 Steel
Engine BalanceInternal
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Need To Know

Truck Shipment

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Quick and Easy Returns

Return Policy

ATK Engines SP38-G4 Details

Engine Specifications:

  • Block: Seasoned 6.0L Iron Gen IV
  • Bore/Stroke: 4.030” x 4.000”
  • Displacement (cu.in): 408
  • Crankshaft: Manley 4340 forged 24 tooth reluctor wheel
  • Rods: Manley 4340 forged H beam 6.125” ARP 8740 bolts
  • Pistons: Manley 2618 forged -18cc dished moly skirt coated
  • Rings: Plasmamoly
  • Compression Ratios: 64cc = 10.2:1 / 68cc = 9.9:1 / 72cc = 9.5:1 (can vary due to deck height/gasket thickness)
  • Camshaft Bearings: Installed and Clocked to OEM Position
  • Freeze Plugs: Installed and Sealed
  • Oil Galley Plugs: Installed and Sealed

    Recommended Components:

  • Balancer- Internal balance
  • Flex plate/ Flywheel- Internal balance
  • Head Gasket: .051” or per application
  • Oil Pump: Melling #10295 with high pressure spring

    Engine Info:

  • Oil: 10W40 Non synthetic for first 3000 miles
  • Oil Filter: Wix or K and N per application

    Disclaimer: The recommended components listed are ATK’s recommendations of parts to be used, applications vary and your build may need something different. Contact ATK for a recommendation if you’re not certain about a component to use. 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 SP38-G4 Specifications

    KEY SPECS
    MFG. Part #SP38-G4
    BrandATK Engines
    Engine Displacement6.7 liters
    Piston MaterialForged Aluminum
    Crankshaft MaterialForged 4340 Steel
    Connecting Rod MaterialForged 4340 Steel
    Engine BalanceInternal
    Rear Main Seal Style1-piece
    Oil Pan IncludedNo
    Timing Cover IncludedNo
    GENERAL
    AssembledYes
    Material TypeCast Iron
    NotesGM 6.0L Gen IV block with 4.030 in. bore and 4.000 in. stroke, -18cc dished pistons and 24 tooth reluctor. Naturally aspirated applications. Includes Manley forged 6.125 in. H-Beam connecting rods, upgraded ARP main studs, and ARP 8740 rod bolts.
    Sold in QuantityEach
    Connecting Rod Beam StyleH-Beam
    Deck Height9.24"
    Main Bolt Style6-bolt
    Piston StyleDish
    Main Journal TypeChevy LS