Description
ATK HP631PM Chevy 496 Stroker Mid Dress Engine 600+ HP
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.
| KEY SPECS | |
|---|---|
| MFG. Part # | HP631PM |
| Brand | ATK Engines |
| Engine Displacement | 8.1 liters |
| Compression Ratio | 10.1:1 |
| Camshaft Type | Hydraulic Roller |
| Cylinder Head Material | Aluminum |
| Carburetor Included | No |
| Intake Manifold Included | Yes |
| Distributor Included | Yes |
| 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 | Yes |
| Harmonic Balancer Included | Yes |
| Flexplate Included | Yes |
| Flywheel Included | No |
| Air Cleaner Included | No |
| Spark Plugs Included | No |
| Spark Plug Wires Included | No |
| Computer Included | No |
| Wiring Harness Included | No |
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