ATK HP631P Chevy 496 Stroker Base Engine 600+ HP




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SKU: HP631P Categories: , ,


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&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.



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