ATK Chevy LS 408 Short Block 24 Tooth Flat Top SP39 Engine

The ATK SP39 Chevy LS 408 Short Block can handle the power of the beasts of the streets. Designed for engines with race gas compression ratios, it can withstand up to 700 horsepower. It contains fully forged rotating assembly that is precisely balanced and blueprinted to deliver optimal engine performance.

Short Block Specification

• Block: GM 6.0L Iron LQ4
  
• Bore/Stroke: 4.030 x 4.000
  
• Displacement: 408 C.I.D.
  
• Crankshaft: Manley 4340 Forged 4.000" Stroker Internally Balanced 24 Tooth
  
• Connecting Rods: Manley 4340 Forged H Beam 6.125" ARP 8740 Bolts
  
• Pistons: Manley 2618 Forged +4cc Flat Top
  
• Piston Rings: Moly Rings
  
• Compression Ratio: 64cc=11.9:1/66cc=11.6:1/70cc=11.1:1
  
• 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!