$275 Shipping

ATK HP31 Chevy 350 87-95 TBI Base Engine 290HP

$275 Shipping

ATK HP31 Chevy 350 87-95 TBI Base Engine 290HP
ATK Engines

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#35020146

ATK HP31 Chevy 350 87-95 TBI Base Engine 290HP

  • Oil: Conventional / Non Synthetic 10W30
  • Oil Filter: Wix or K&N per application
  • Timing: 34-36 Degrees
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$3,495.99

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Product Summary

Long Block Crate Engine Type, 9.1:1 Compression Ratio

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

Crate Engine TypeLong Block
Compression Ratio9.1:1
Engine Displacement350 cu. in.
Camshaft TypeHydraulic Flat Tappet
Cylinder Head MaterialCast Iron
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Made to Order

This custom item will ship when completed

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ATK Engines HP31 Details

This engine was designed to run with all your vehicles stock components. Must have a chip burned, upgraded intake and headers for optimal performance.

Engine Specifications:

  • HP: 290
  • TQ: 373
  • Block: OE block 4 bolt main 1pc seal 1987-1995
  • Bore/Stroke: 4.040” x 3.480”
  • Displacement: 350CI
  • Crankshaft: OE Reground external balance rear of crank/internal balance front of the crank
  • Rods: OE powder metal 5.7”
  • Pistons: Hypereutectic 9.1:1 compression
  • Rings: Moly
  • Camshaft: Hyd. roller
  • Cam Specs: 198/210 @50 .435in/.462ex 116LSA
  • Timing Chain: Double roller
  • Cylinder Heads: OE TBI cast iron 67cc 1.94/1.50
  • Rocker Arms: Stamped steel 1.5 ratio
  • Oil Pan: Rear sump 5qt (not for Chevelles with steering behind crossmember, some corvettes and 62-67 chevy II’s)
  • Oil Pump: Melling STD volume

    Recommended Components:

  • Balancer: Internally balanced – PowerBond #PB1046-N
  • Flexplate/Flywheel: Externally balanced – Pioneer #FRA-159
  • Intake Manifold: OE or Edelbrock TBI intake #3704
  • Spark Plugs: Autolite #605
  • Spark Plug Wires: Factory replacements
  • Water Pump: OE

    Engine Info:

  • Oil: Conventional / Non Synthetic 10W30
  • Oil Filter: Wix or K and N
  • Timing: Set To Factory Specifications Via PCM Module – Must have Performance Chip Burned
  • Spark Plug Gap: .035”
  • Firing Order: 18436572
  • Octane: 91+
  • Stall Converter: Stock
  • Exhaust: 1 5/8 Headers

    Notes: Engine is meant for the 1987-1995 Chevy Trucks with a 350 TBI engine. ECM needs a chip burned to run properly.

    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
    CA Prop 65
    CARB warning

    ATK Engines HP31 Specifications

    KEY SPECS
    MFG. Part #HP31
    BrandATK Engines
    Crate Engine TypeLong Block
    Compression Ratio9.1:1
    Engine Displacement350 cu. in.
    Camshaft TypeHydraulic Flat Tappet
    Cylinder Head MaterialCast Iron
    Piston MaterialHypereutectic Aluminum
    Carburetor IncludedNo
    Intake Manifold IncludedNo
    Distributor IncludedNo
    Valve Covers IncludedYes
    Cylinder Heads IncludedYes
    Throttle Body IncludedNo
    Timing Cover IncludedNo
    Oil Pan IncludedYes
    Water Pump IncludedYes
    Harmonic Balancer IncludedNo
    Flexplate IncludedNo
    Flywheel IncludedNo
    Air Cleaner IncludedNo
    Spark Plugs IncludedNo
    Spark Plug Wires IncludedNo
    Computer IncludedNo
    Wiring Harness IncludedNo
    GENERAL
    Bore x Stroke (in)4.040" x 3.750"
    Material TypeCast Iron
    GTIN Code00653517143144
    Sold in QuantityEach

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    Fitment

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