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ATK GM LM7 383 Stroker 515+ HP Base LM7-LB-3

ATK GM LM7 383 Stroker 515+ HP Base LM7-LB-3

Item #22659

ATK LM7-LB-3 GM LM7 383 Stroker Base Engine 515HP
Quantity: close
Only $7,100.00

• This item ships directly from the manufacturer

• Expected delivery time is 1 – 2 weeks

• Not available in Eastwood Retail Stores

• Order may not be changed or canceled


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The ATK LM7-LB-3 GM LM7 383 Stroker 515HP Base is the first step in constructing your heavyweight car. Producing huge mid- to upper-end power along with noticeable idle, it delivers more than 515 horsepower and above 500 torque for superior acceleration and muscle. This crate engine works with your existing components.

Engine Specifications:

  • Horsepower: 515+
  • Torque: 500+
  • Block: LM7 5.3L Gen 3
  • Bore/Stroke: 3.903 x 4.000
  • Year Range: 1999-2007
  • Displacement: 383CI
  • Crankshaft: K1 4340 Forged 24 tooth reluctor
  • Connecting Rods: Scat 6.125" Forged I Beams with ARP 8740 Bolts
  • Pistons: Wiseco 2618 Forged
  • Piston Rings: Wiseco GFX (Steel top ring)
  • Compression Ratio: 10.3:1 Compression
  • Camshaft: Hydraulic Roller
  • Camshaft Specifications: 218/224 @50 .604/.604 112LSA
  • Camshaft Bearings: Installed & Clocked to OEM Position
  • Cylinder Heads: CNC Ported Cathedral Port cores 2.02/1.60, dual valve springs, titanium retainers
  • Rocker Arms: OE Rocker Arms with trunion upgrade
  • Oil Galley Plugs: Installed & Sealed
  • Weight: 412

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

More info...
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ATK High Performance GM LM7/LS1 383CI 515+ HP Stage 1 Long Block Crate Engines


Engine Information:

• Oil: 5W30
• Oil Filter: Wix or K&N Recommended Per Your Application
• Fuel Delivery: OE EFI System With Tune or Carb
• Intake Manifold: Factory or Aftermarket
• Fuel Injectors: 36lb for optimal Performance
• Spark Plugs: NGK #3186
• Spark Plug Gap: .035"
• Harmonic Balancer/Damper: Stock Factory Balancer Internally Balanced
• Flex Plate / Flywheel: Stock Internally Balanced
• Tuning: Needs Tune/Preferably Chassis Dyno Tune
• Timing: Set To Factory Specifications Via PCM Module (Tune Required)
• Water Pump: Per Application
• Firing Order: 1 8 7 2 6 5 4 3
• Exhaust: 1 7/8 Headers
• Fuel Pump: Upgraded
• Fuel: 91+ Octane
• Ignition: Coil Packs
• Automatic Transmission Stall Converter: 2500+


Click Here to view ATK Engines Warranty


Recommended Components:

• Balancer: Stock internal balance/per application
• Intake Manifold: Stock EFI, aftermarket EFI, or carbureted intake
• Flexplate/Flywheel: Stock internal balance
• Fuel Pump: Electric per application
• Fuel Injectors: 36lb injectors
• Spark Plugs: NGK #739-TR5GP
• Spark Plug Wires: Factory
• 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.

Eastwood Offers Free Lifetime Technical Support

Click here for product SDS information

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