$275 Shipping

ATK HP631PM Chevy 496 Stroker Mid Dress Engine 600+ HP

$275 Shipping

ATK HP631PM Chevy 496 Stroker Mid Dress Engine 600+ HP
ATK Engines

|

#35020233

ATK HP631PM Chevy 496 Stroker Mid Dress Engine 600+ HP

  • Stroker 496ci V8 built for 600+ HP and high torque
  • Dart Pro 1 heads and forged internals for maximum strength
  • Includes intake, timing cover, oil pan — mid-dress ready
See More

Level Of Dress:

#2 Mid Dress

#1 Base Engine#3 Complete Dress

$11,599.00

/each

Factory Shipped


Quantity

Need Help? Call to Order

Add to a list

Share

Select an engine to verify Fitment

Select Engine

Product Summary

Long Block Crate Engine Type, 10.1:1 Compression Ratio

  • Stroker 496ci V8 built for 600+ HP and high torque
  • Dart Pro 1 heads and forged internals for maximum strength
  • Includes intake, timing cover, oil pan — mid-dress ready
  • Hydraulic roller cam optimized for street/strip performance
  • Dyno-verified and ready for drop-in installation
See more details

Key Specs

Crate Engine TypeLong Block
Compression Ratio10.1:1
Engine Displacement496 cu. in.
Camshaft TypeHydraulic Roller
Cylinder Head MaterialAluminum
See more specs

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

Need help?

855.313.9176
View the Help Center

Quick and Easy Returns

Return Policy

ATK Engines HP631PM Details

Engine Specifications:

  • HP: 600
  • TQ: 605
  • Block: Seasoned OE 4 bolt main 1pc seal Gen V 1991-1995
  • Bore/Stroke: up to 4.310” x 4.250”
  • Displacement: 496CI
  • Crankshaft: Scat 4340 forged 4.250” stroke internally balanced 1pc
  • Rods: Scat 4340 forged H beam 6.385” with ARP 8740 bolts
  • Pistons: Forged 10.1:1` compression
  • Rings: Moly
  • Camshaft: Hyd. roller
  • Cam Specs: 247/255 @50 .680in/.680ex 110LSA
  • Timing Chain: Double roller
  • Cylinder Heads: Edelbrock aluminum 118cc/315cc 2.19/1.88
  • Rocker Arms: Howards billet aluminum 1.7 roller rockers
  • Oil Pan: Moroso street/strip 6qt with kick outs #20413
  • Oil Pump: Melling high volume
  • Balancer: Professional Products internal balance 8” #80004
  • Flexplate/Flywheel: Pioneer #FRA-100 internal balance 168 tooth
  • Intake Manifold: Edelbrock performer RPM air gap #7562
  • Distributor: Pro billet (Iron gear)
  • Water Pump: Weiand aluminum long pump #9242

    • Recommended Components:

  • Carburetor: Quick Fuel 850CFM mechanical secondary no choke #Q-850
  • Fuel Pump: No mechanical fuel pump provision, must run an electric pump
  • 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: 18436572
  • Octane: 91+
  • Stall Converter: 3000+
  • Exhaust: 2” 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
    CA Prop 65
    CARB warning

    ATK Engines HP631PM Specifications

    KEY SPECS
    MFG. Part #HP631PM
    BrandATK Engines
    Crate Engine TypeLong Block
    Compression Ratio10.1:1
    Engine Displacement496 cu. in.
    Camshaft TypeHydraulic Roller
    Cylinder Head MaterialAluminum
    Piston MaterialForged Aluminum
    Carburetor IncludedNo
    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 IncludedNo
    Spark Plug Wires IncludedNo
    Computer IncludedNo
    Wiring Harness IncludedNo
    GENERAL
    Sold in QuantityEach

    Questions & Answers

    Be the first to ask a question.

    Fitment

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    • 454 Chevy Big Block V8

    Customer Impersonation Script