Description
ATK HP42 Chevy 540 Base Engine 660+ HP
This is a street/strip engine it will have a lopey idle, vacuum will be marginal for power brakes, and big power for the track or the street. Your engine may not necessarily come with all components listed, but they are listed as our recommendations of parts to run for optimal performance.
Engine Specifications:
- HP: 660
- TQ: 650
- Block: Dart Big M 4 bolt main 2pc seal
- Bore/Stroke: 4.500” x 4.250”
- Displacement: 540
- Crankshaft: Manley 4340 forged internal balance
- Rods: Manley 4340 forged H beam with ARP 8740 bolts
- Pistons: Forged 10.1:1` compression
- Rings: Moly
- Camshaft: Hyd. roller
- Cam Specs: 243/249 @50 .640in/.640ex 112LSA
- Timing Chain: Double roller
- Cylinder Heads: Dart Pro 1 aluminum 121cc/320cc 2.250/1.880
- Rocker Arms: Howards billet aluminum 1.7 roller rockers
- Oil Pan: Moroso 7qt street/strip pan with windage tray
- Oil Pump: Melling high volumeRecommended 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 action + long pump #9242
- Carburetor: Quick Fuel 950CFM mechanical secondary no choke #Q-950
- Fuel Pump: Holley mechanical 130GPH #12-454-13
- Spark Plugs: Autolite #3934
- Spark Plug Wires: 8mmEngine 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” HeadersDisclaimer:
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 # | HP42 |
| Brand | ATK Engines |
| Engine Displacement | 8.8 liters |
| 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 | 2-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 |
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