Product Summary

Deluxe Crate Engine Crate Engine Type, Oil Pan Included

  • Block: GM LM7 5.3L (Iron LS1 / LS6)
  • Year Range: 1999-2007
  • Bore/Stroke: 3.903” x 3.622”
  • Displacement (cu.in): 347
  • Crankshaft: OE Reground .010”/.010” 24 tooth
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Key Specs

Crate Engine TypeDeluxe Crate Engine
Compression Ratio10.1:1
Engine Displacement347 cu. in.
Camshaft TypeHydraulic Flat Tappet
Cylinder Head MaterialAluminum
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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 HP20C Details

Engine Specifications:

  • HP: 415
  • TQ: 430
  • Block: Seasoned OE Roller Block 1987-1995
  • Bore/Stroke: 4.040 x 3.400
  • Displacement: 347CI
  • Crankshaft: Scat nodular iron external balance 28oz
  • 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: Fox Body (Mustang Dual Sump)
  • Oil Pump: Melling high volume
  • Balancer: External balance 28oz (with Scat kit)
  • Flexplate/Flywheel: External balance 28oz 164 tooth (with Scat kit)
  • Intake Manifold: Edelbrock performer RPM #7121
  • Carburetor: Quick Fuel 680CFM vacuum secondary’s electric choke #HR-680cfm
  • Fuel Pump: Mechanical fuel pump
  • Distributor: Pro billet (upgraded melonite gear)
  • Spark Plugs: Autolite #3923
  • Spark Plug Wires: MSD 8mm #5541
  • Water Pump: OE reverse rotation LH inlet

    Engine Info:

  • Oil: Conventional / Non Synthetic 10W30
  • Oil Filter: Wix or K and N
  • Timing: 34-36 Degrees
  • Spark Plug Gap: .035”
  • Firing Order: 13726548
  • Octane: 91+
  • Stall Converter: 2400-2800
  • Exhaust: 1 5/8

    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 HP20C Specifications

    KEY SPECS
    MFG. Part #HP20C
    BrandATK Engines
    Crate Engine TypeDeluxe Crate Engine
    Compression Ratio10.1:1
    Engine Displacement347 cu. in.
    Camshaft TypeHydraulic Flat Tappet
    Cylinder Head MaterialAluminum
    Piston MaterialForged Aluminum
    Carburetor IncludedYes
    Intake Manifold IncludedYes
    Distributor IncludedNo
    Valve Covers IncludedYes
    Cylinder Heads IncludedYes
    Throttle Body IncludedNo
    Timing Cover IncludedYes
    Oil Pan IncludedYes
    Water Pump IncludedYes
    Harmonic Balancer IncludedYes
    Flexplate IncludedNo
    Flywheel IncludedNo
    Air Cleaner IncludedNo
    Spark Plugs IncludedYes
    Spark Plug Wires IncludedYes
    Computer IncludedNo
    Wiring Harness IncludedNo
    GENERAL
    Combustion Chamber Volume58cc
    Camshaft Duration (.050 in)220° intake / 224 ° exhaust
    Bore x Stroke (in)3.903" x 3.622"
    Material TypeIron
    GTIN Code00653517260087
    NotesIncludes fox body style oil pan and pickup tube.
    Sold in QuantityEach

    Questions & Answers

    Fitment

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