ATK LS 408 Stroker Engine 620HP LS3 Alum LS02C

Item #22667

Made in the USA
ATK LS 408 Stroker Engine 620HP LS3 Alum LS02C
ATK LS02C LS 408 Stroker Engine 620HP
* ** THIS ITEM IS TEMPORARILY OUT OF STOCK *** FREE SHIPPING on ATK Engines. This item ships directly from the manufacturer and is not available for store pickup. Some engines are made-to-order or can be backordered. Delivery can be delayed up to 5 to 6 weeks but typically ship within 2 weeks.
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Rule the street with this ATK LS02C LS 408 Stroker Engine. Producing 620+ horsepower and 550 lb/ft torque, this assembled engine offers great top end power. Aluminum cylinder heads enhance the performance and the forged crankshaft and pistons assure durability. This long block crate engine includes carburetor, oil pan, valve covers, timing cover, harmonic balancer, spark plugs and spark plug wires.

Engine Specifications:

  • Horsepower: 620+
  • Torque: 550 lb/ft
  • Block: New GM L92/LS3 Aluminum
  • Bore/Stroke: 4.065 x 4.000
  • Displacement: 415 C.I.D.
  • Crankshaft: Manley 4340 Forged 4.000" Stroke Internally Balanced
  • Connecting Rods: Manley 4340 Forged H Beam 6.125 ARP 8740 Bolts
  • Pistons: Forged
  • Piston Rings: Moly Rings
  • Compression Ratio: 10.3:1 Compression
  • Camshaft: Hydraulic Roller
  • Camshaft Specifications: 240/256 @050 .625in/.625ex 113LSA
  • Camshaft Bearings: Installed & Clocked to OEM Position
  • Cylinder Heads: LS3 Aluminum 68.4cc/260cc 2.16/1.59
  • Freeze Plugs: Brass Installed & Sealed
  • Rocker Arms: GM Roller 1.7 Ratio
  • Oil Galley Plugs: Installed & Sealed
  • Oil Pan: GM Muscle Car Pan 5qt.
  • Weight: 430

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.

Don't forget the engine paint!
Engine Paint


ATK High Performance GM 415 LS3 Stroker 620 HP Stage 3 Long Block Crate Engines


Engine Information:

• Oil: 10W30
• Oil Filter: Wix or K&N Recommended Per Your Application
• Fuel Delivery: Quick Fuel Carburetor 850cfm #Q-850
• Intake Manifold: Edelbrock Victor JR. Carbureted #28457
• Spark Plugs: NGK #3186
• Spark Plug Gap: .035"
• Harmonic Balancer/Damper: POWERBOND Internally Balanced SFI #PB1480-SS (Truck Accessories)
• Flex Plate / Flywheel: Internally Balanced (Not Included)
• Timing: 34-36 Degrees Total
• Water Pump: Choose Water Pump Per Application
• Firing Order: 1 8 7 2 6 5 4 3
• Exhuast: 1 3/4 Headers
• Fuel Pump: Aftermarket Electric Pump
• Fuel: 91+ Octane
• Ignition: Coil Packs
• Automatic Transmission Stall Converter: 3000+


Recommended Components:

• lexplate/Flywheel: Stock internal balance
• Fuel Pump: Electric
• Timing Control: MSD #121-6014 with baseline of 10deg @0rpm, 20deg @ 500 rpm, 26deg @ 1500rpm, and 31deg at 2500-6500rpm
• Water Pump: Per application

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.

Shipping Instructions

Shipping is free and lift gate will be provided.

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