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ATK Chevy LS 408 Short Block 58 Tooth -18cc Dished SP31 Engine

Item #22680

ATK Chevy LS 408 Short Block 58 Tooth -18cc Dished SP31 Engine
ATK SP31 Chevy LS 408 Short Block 58 Tooth -18cc
* * FREE SHIPPING on ATK Engines. This item ships directly from the manufacturer and is not available for store pickup. Some engines are made-to-order or can be backordered. Delivery can be delayed up to 4 to 5 weeks but usually ship within one week
$3,958.88
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Details

The ATK Chevy LS 408 Short Block is built for tough and withstanding use. Boasting GM iron block, this short block comes installed with Manley forged crankshaft, Manley forged H beam and Manley forged pistons. Mild compression ratio makes this unit easy to tune on pump gas. This short block comes installed with sealed freeze plugs and oil galley plugs.

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 58 Tooth
  • Connecting Rods: Manley 4340 Forged H Beam 6.125" ARP 8740 Bolts
  • Pistons: Manley 2618 Forged +18cc Dished
  • Piston Rings: Moly Rings
  • Compression Ratio: 64cc=10.2:1/66cc=10.0:1/70cc=9.6:1
  • 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!
Engine Paint

Contents

ATK High Performance Chevy LS 408 Short Blocks


Specifications

Engine Information:

• Oil: 5W30
• Harmonic Balancer/Damper: Internally Balanced
• Flex Plate / Flywheel: Internally Balanced


Accessories

Recommended Components:

• Balancer: Internal balance
• Flexplate/Flywheel: Internal balance
• Head Gasket: .051" thickness or per application
• Oil: 10W40 Non synthetic for first 3000 miles
• Oil Filter: Wix or K&N per application
• Oil Pump: Melling #689-10295 with high pressure spring

Disclaimer: The parts listed are ATK’s recommendations of parts to be used to obtain our power figures listed. Power figures can vary based on parts used by the end user. It is the customer’s responsibility to verify components will work for their application. Some modifications to the vehicle may be required using these and or other aftermarket parts.


Shipping Instructions

Shipping is free and lift gate will be provided.


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