ATK Chevy LM-7/LS 347CI Short Block Engine -11cc Dished Pistons 24 Tooth SP76

If you are building a high-performance engine, then you will need this ATK Chevy LM-7/LS 347CI Short Block. It comes with Scat Premium Pro 4340 forged pistol to handle horsepower up to 700HP. Internally balanced OE Reground 3.622" crankshaft and Scat Premium Pro 4340 forged connecting rods ensure optimal performance of the short block.

Short block Specifications:

• Block: GM LM7 5.3L
  
• Bore/Stroke: 3.903 x 3.622
  
• Displacement: 5.7/347 C.I.D.
  
• Crankshaft: OE Reground 3.622" Internally Balanced 24 Tooth
  
• Connecting Rods: Scat Premium Pro 4340 Forged I Beam 6.125" ARP 8740 Bolts
  
• Pistons: Wiseco 2618 Forged -11cc Dished - Coated Skirts
  
• Piston Rings: Wiseco GFX (Alloy Steel top ring)
  
• Compression Ratio: 65cc= 9.7:1 / 67cc= 9.5:1 / 70cc= 9.2:1
  
• Camshaft Bearings: Installed & Clocked to OEM Position
  
• Freeze Plugs: Brass Installed & Sealed
  
• Oil Galley Plugs: Installed & Sealed
  
• Weight: 285
  

Every great build needs a solid foundation! For that reason, we take the hard work out of the picture by selling short blocks that are ready for you to complete yourself. Our GM Short Blocks are most commonly packaged as the engine block assembled with Pistons, Piston Rings and Crankshaft installed.

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!