ATK HP42 Chevy 540 Base Engine 660+ HP



Lead Time: Estimated: 4 - 6 weeks

SKU: HP42 Categories: , ,


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 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 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: 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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