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

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 ft.lb 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!