ATK GM LM7 383 Stroker 540+ HP Base LM7-LB-4 Engine

Your car gets a major makeover with the ATK LM7-LB-4 GM LM7 383 Stroker 540HP Base. Extremely streetable 540+ horsepower and 500+ torque is more than enough to leave a lasting impression on the tracks. This base engine is perfect for completing the muscle ride with your existing components.

Engine Specifications:

• Horsepower: 540+
  
• 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: 10.4:1 Compression
  
• Camshaft: Hydraulic Roller
  
• Camshaft Specifications: 228/234 @50 .604/.609 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!