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ATK HP631P Chevy 496 Stroker Base Engine 600+ HP

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#35020231

ATK HP631P Chevy 496 Stroker Base Engine 600+ HP

Base 496 stroker engine built to deliver 600 HP
Forged crank, rods, and pistons ensure long-term reliability
Aluminum heads offer efficient combustion and airflow

Level Of Dress:

#1 Base Engine

$9,999.00

/each

Factory Shipped

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Product Summary

Long Block Crate Engine Type, 10.1:1 Compression Ratio

Base 496 stroker engine built to deliver 600 HP
Forged crank, rods, and pistons ensure long-term reliability
Aluminum heads offer efficient combustion and airflow
Hydraulic roller cam balances street manners and power
Perfect platform for high-performance Chevy builds

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Key Specs

Crate Engine Type	Long Block
Engine Displacement	8.1 liters
Compression Ratio	10.1:1
Camshaft Type	Hydraulic Roller
Cylinder Head Material	Aluminum

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Need To Know

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

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ATK Engines HP631P Details

Designed for street/strip it will have a rough idle, power brakes will not work, and expect big power.

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

Recommended Components:

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

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 Prop 65

CARB warning

ATK Engines HP631P Specifications

KEY SPECS
MFG. Part #	HP631P
Brand	ATK Engines
Crate Engine Type	Long Block
Engine Displacement	8.1 liters
Compression Ratio	10.1:1
Camshaft Type	Hydraulic Roller
Cylinder Head Material	Aluminum
Carburetor Included	No
Intake Manifold Included	No
Distributor Included	No
Valve Covers Included	Yes
Engine Balance	Internal
Cylinder Heads Included	Yes
Rear Main Seal Style	1-piece
Throttle Body Included	No
Oil Pan Included	Yes
Timing Cover Included	Yes
Water Pump Included	No
Harmonic Balancer Included	No
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
Assembled	Yes
Material Type	Cast Iron
Sold in Quantity	Each
Crate Engine Family	Chevy Big Block
Supercharger Included	No

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Fitment

1970-1975 Chevy Bel Air

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1970-1972 Chevy Biscayne

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1970-1972 Chevy Brookwood

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1973-1979 Chevy C10

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1973-1979 Chevy C10 Suburban

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1990-1991 Chevy C1500

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1973-1986 Chevy C20

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1987 Chevy C20

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1973-1986 Chevy C20 Suburban

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1991 Chevy C2500

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1973-1986 Chevy C30

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1988-1991 Chevy C3500

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1970-1976 Chevy Caprice

454 Chevy Big Block V8

1970-1973 Chevy Chevelle

454 Chevy Big Block V8

1970-1974 Chevy Corvette

454 Chevy Big Block V8

1970-1975 Chevy El Camino

454 Chevy Big Block V8

1970 Chevy Estate

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1988-1991 Chevy G30

454 Chevy Big Block V8

1970-1976 Chevy Impala

454 Chevy Big Block V8

1973-1974 Chevy K10

454 Chevy Big Block V8

1973-1974 Chevy K10 Suburban

454 Chevy Big Block V8

1973-1974 Chevy K20

454 Chevy Big Block V8

1973-1974 Chevy K20 Suburban

454 Chevy Big Block V8

1985 Chevy K20 Suburban

454 Chevy Big Block V8

1991 Chevy K2500

454 Chevy Big Block V8

1977-1986 Chevy K30

454 Chevy Big Block V8

1988-1991 Chevy K3500

454 Chevy Big Block V8

1970-1972 Chevy Kingswood

454 Chevy Big Block V8

1973-1975 Chevy Laguna

454 Chevy Big Block V8

1973-1975 Chevy Malibu

454 Chevy Big Block V8

1970-1975 Chevy Monte Carlo

454 Chevy Big Block V8

1975-1991 Chevy P30

454 Chevy Big Block V8

1973-1974 Chevy P30 Van

454 Chevy Big Block V8

1987-1988 Chevy R20

454 Chevy Big Block V8

1987-1988 Chevy R20 Suburban

454 Chevy Big Block V8

1989 Chevy R2500

454 Chevy Big Block V8

1989-1991 Chevy R2500 Suburban

454 Chevy Big Block V8

1987-1988 Chevy R30

454 Chevy Big Block V8

1989-1991 Chevy R3500

454 Chevy Big Block V8

1970-1972 Chevy Townsman

454 Chevy Big Block V8

1987-1988 Chevy V20 Suburban

454 Chevy Big Block V8

1990 Chevy V2500 Suburban

454 Chevy Big Block V8

1987-1988 Chevy V30

454 Chevy Big Block V8

1989-1991 Chevy V3500

454 Chevy Big Block V8

1975-1978 GMC C15

454 Chevy Big Block V8

1975-1978 GMC C15 Suburban

454 Chevy Big Block V8

1973-1974 GMC C15/C1500 Pickup

454 Chevy Big Block V8

1973-1974 GMC C15/C1500 Suburban

454 Chevy Big Block V8

1979 GMC C1500

454 Chevy Big Block V8

1979 GMC C1500 Suburban

454 Chevy Big Block V8

1975-1978 GMC C25

454 Chevy Big Block V8

1975-1978 GMC C25 Suburban

454 Chevy Big Block V8

1973-1974 GMC C25/C2500 Pickup

454 Chevy Big Block V8

1973-1974 GMC C25/C2500 Suburban

454 Chevy Big Block V8

1979-1986 GMC C2500

454 Chevy Big Block V8

1988-1991 GMC C2500

454 Chevy Big Block V8

1979-1986 GMC C2500 Suburban

454 Chevy Big Block V8

1975-1978 GMC C35

454 Chevy Big Block V8

1979-1986 GMC C3500

454 Chevy Big Block V8

1988-1991 GMC C3500

454 Chevy Big Block V8

1977-1978 GMC K35

454 Chevy Big Block V8

1979-1986 GMC K3500

454 Chevy Big Block V8

1988-1991 GMC K3500

454 Chevy Big Block V8

1987-1989 GMC R2500

454 Chevy Big Block V8

1987-1991 GMC R2500 Suburban

454 Chevy Big Block V8

1987-1991 GMC R3500

454 Chevy Big Block V8

1971-1972 GMC Sprint

454 Chevy Big Block V8

1973-1977 GMC Sprint

454 Chevy Big Block V8