ATK Chevy LS 408 Boost/Nitrous Short Block 24 Tooth Flat Top SP39-B Engine

Build your own ride packed with sheer power by using this ATK SP39-B Chevy LS 408 Boost/Nitrous Short Block 24 Tooth Flat Top. It is especially designed for engines that will be used with boost or nitrous. This short block contains fully forged crankshaft, connecting rod and pistons, so you don't have to worry about reliability.

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 2000 Bolts
  
• Pistons: 2618 Forged +4cc Flat Top
  
• Piston Rings: Total Seal CS AP Steel Top Ring
  
• 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!