Product Summary

Short Block Crate Engine Type, No Value Camshaft Type

  • Oil: Conventional / Non Synthetic 10W30
  • Oil Filter: Wix or K&N
  • Timing: 34-36 Degrees
  • Spark Plug Gap: .035”
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Key Specs

Crate Engine TypeShort Block
Engine Displacement383 cu. in.
Piston MaterialForged Aluminum
Crankshaft MaterialForged 4340 Steel
Carburetor IncludedNo
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Need To Know

Made to Order

This custom item will ship when completed

Truck Shipment

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

Quick and Easy Returns

Return Policy

ATK Engines SP77 Details

Engine Specifications:

  • Block: GM LM7 5.3L (Iron LS1 / LS6)
  • Year Range: 1999-2007
  • Bore/Stroke: 3.903” x 4.000”
  • Displacement (cu.in): 383
  • Crankshaft: Manley 4340 forged 24 tooth
  • Rods: Scat premium pro 4340 I beam with ARP 8740 bolts
  • Pistons: Wiseco 2618 forged -8cc dished moly skirt coated
  • Rings: Wiseco GFX (alloy steel top ring)
  • Compression Ratios: 65cc = 10.7:1 / 67cc = 10.5:1 / 70cc = 10.2:1 (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 SP77 Specifications

    KEY SPECS
    MFG. Part #SP77
    BrandATK Engines
    Crate Engine TypeShort Block
    Engine Displacement383 cu. in.
    Piston MaterialForged Aluminum
    Crankshaft MaterialForged 4340 Steel
    Carburetor IncludedNo
    Intake Manifold IncludedNo
    Distributor IncludedNo
    Connecting Rod MaterialForged 4340 Steel
    Valve Covers IncludedNo
    Cylinder Heads IncludedNo
    Throttle Body IncludedNo
    Timing Cover IncludedNo
    Oil Pan 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
    Reluctor Wheel24x
    GENERAL
    Combustion Chamber Volume64cc
    Bore x Stroke (in)3.903" x 4.00"
    AssembledYes
    Material TypeCast Iron
    Notes24X reluctor wheel. 8cc piston volume.
    Sold in QuantityEach
    Connecting Rod Beam StyleI-Beam
    Piston StyleDish

    Questions & Answers

    Fitment

    • GM LM7

    • GM LM7

    • GM LM7

    • GM LM7

    • GM LM7

    • GM LM7

    • GM LM7

    • GM LM7

    • GM LM7

    • GM LM7

    • GM LM7

    • GM LM7

    • GM LM7

    • GM LM7

    • GM LM7

    • GM LM7

    Customer Impersonation Script