Experience a breath-taking performance with this ATK HP42M Chevy 540CI Engine. Its enormous 660+ and 650+ lb/ft torque gives you the ability to stun the competition. This long block engine is equipped with dart aluminum heads for boosted performance. The forged and sealed components enhance safety and reliability.
- Horsepower: 660+
- Torque: 650+ lb/ft
- Block: Dart Big M 9.8 4 Bolt Main 2pc Seal
- Bore/Stroke: 4.500 x 4.250
- Displacement: 540 C.I.D.
- Crankshaft: Manley 4340 Forged 4.250" Stroke Internally Balanced 2pc.
- Connecting Rods: Manley 4340 Forged H Beam 6.385" ARP 8740 Bolts
- Pistons: Forged
- Piston Rings: Moly Rings
- Compression Ratio: 10.1:1 Compression
- Camshaft: Hydraulic Roller
- Camshaft Specifications: 243/249 @050 .640in/.640ex 112LSA
- Camshaft Bearings: Installed & Clocked to OEM Position
- Cylinder Heads: Dart Aluminum 121cc/325cc 2.25/1.88
- Freeze Plugs: Brass Installed & Sealed
- Rocker Arms: Howards Billet Aluminum Full Roller 1.7 Ratio
- Oil Galley Plugs: Installed & Sealed
- Oil Pan: Moroso 6qt.
ATK specializes in muscle. With the highest quality internal parts and Dyno Proven combinations of every engine built, ATK is able to add the most bang for your buck and back it up with an industry leading warranty.
ATK High Performance GM 540 660+ HP Stage 2 Long Block Crate Engines
• Oil: 10W30
• Oil Filter: Wix or K&N Recommended Per Your Application
• Fuel Delivery: Quick Fuel Carburetor 850cfm #Q-850
• Intake Manifold: Edelbrock Performer RPM Air-Gap Dual Plane #7562
• Spark Plugs: Autolite #AR3934
• Spark Plug Gap: .035"
• Harmonic Balancer/Damper: Professional Products Internally Balanced 8" #80004
• Flex Plate / Flywheel: Internally Balanced 168 Tooth
• Timing: 34-36 Degrees Total
• Water Pump: Long Water Pump
• Firing Order: 1 8 4 3 6 5 7 2
• Exhuast: 2 1/8 Headers
• Fuel Pump: Holley 130GPH Mechanical #12-454-13
• Fuel: 91+ Octane
• Ignition: MSD Pro Billet #85551
• Automatic Transmission Stall Converter: 3000+
• Carburetor: Quick Fuel 950cfm mechanical secondary no choke #793-Q-950
• Fuel Pump: Holley mechanical 130gph #510-12-454-13
• Spark Plugs: Autotile #417-3934
• Spark Plug Wires: 8mm
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 for their application. Some modifications to the vehicle may be required using these and or other aftermarket parts.
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