ATK’s new Pro Street 632CI is sure to turn heads! Hand built here in Texas stuffed with name brand quality components you can trust. This engine is ONLY available straight through ATK at this time.

Engine Specifications:

HP: 820+

TQ: 800+

Block: Dart Big M 10.2 Deck 4 bolt main 2pc seal

Bore/Stroke: 4.600” x 4.750”

Displacement: 632

Crankshaft: Scat 4340 forged internal balance

Rods: Scat 4340 forged H beam with ARP 8740 bolts

Pistons: Forged 10.3:1 compression

Rings: Moly

Camshaft: Hyd. roller

Cam Specs: 267/277 @50 .680in/.680ex 110LSA

Timing Chain: Double roller

Cylinder Heads: ATK aluminum 121cc/360cc 2.300/1.880

Rocker Arms: Howards billet aluminum 1.7 roller rockers

Oil Pan: Moroso 7qt street/strip pan with windage tray

Oil Pump: Melling high volume

Balancer: Power Bond SFI 7.950”

Flexplate/Flywheel: N/A

Intake Manifold: Edelbrock Super Victor

Distributor: Pro billet (Iron gear)

Water Pump: N/A

Carburetor: Quick Fuel 1150CFM mechanical secondary

Fuel Pump: N/A

Spark Plugs: Autolite #3934

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 1/4” 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 HP108C Specifications

KEY SPECS
MFG. Part #	HP108C
Brand	ATK Engines
Crate Engine Type	Long Block
Engine Displacement	10.3 liters
Compression Ratio	10.3:1
Camshaft Type	Hydraulic Roller
Cylinder Head Material	Aluminum
Carburetor Included	Yes
Intake Manifold Included	Yes
Distributor Included	Yes
Valve Covers Included	Yes
Engine Balance	Internal
Cylinder Heads Included	Yes
Rear Main Seal Style	2-piece
Throttle Body Included	No
Oil Pan Included	Yes
Timing Cover Included	Yes
Water Pump Included	No
Harmonic Balancer Included	Yes
Flexplate Included	No
Flywheel Included	No
Air Cleaner Included	No
Spark Plugs Included	Yes
Spark Plug Wires Included	Yes
Computer Included	No
Wiring Harness Included	No

GENERAL
Assembled	Yes
Material Type	Cast Iron
GTIN Code	00653517631320
Sold in Quantity	Each
Crate Engine Family	Chevy Big Block
Supercharger Included	No

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