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ATK HP631PM Chevy 496 Stroker Mid Dress Engine 600+ HP

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#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

Level Of Dress:

#2 Mid Dress

$11,599.00

/each

Factory Shipped

Quantity

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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

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Key Specs

Crate Engine Type	Long Block
Compression Ratio	10.1:1
Engine Displacement	496 cu. in.
Camshaft Type	Hydraulic Roller
Cylinder Head Material	Aluminum

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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

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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.

Guides & Documents

Warranty (ATK Engines)

Technical Information (ATK Engines)

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 WARNING:

Can expose you to lead, a carcinogen and reproductive toxicant. See www.P65Warnings.ca.gov

CARB warning

ATK Engines HP631PM Specifications

KEY SPECS
MFG. Part #	HP631PM
Brand	ATK Engines
Crate Engine Type	Long Block
Compression Ratio	10.1:1
Engine Displacement	496 cu. in.
Camshaft Type	Hydraulic Roller
Cylinder Head Material	Aluminum
Piston Material	Forged Aluminum
Carburetor Included	No
Intake Manifold Included	Yes
Distributor Included	No
Valve Covers Included	Yes
Cylinder Heads Included	Yes
Throttle Body Included	No
Timing Cover Included	Yes
Oil Pan Included	Yes
Water Pump Included	Yes
Harmonic Balancer Included	Yes
Flexplate Included	No
Flywheel Included	No
Air Cleaner Included	No
Spark Plugs Included	No
Spark Plug Wires Included	No
Computer Included	No
Wiring Harness Included	No

GENERAL
Sold in Quantity	Each

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