Description
ATK SP31 LS 408CI Stroker Short Block -18cc Dish Pistons 58 Tooth
Engine Specifications:
- Block: Seasoned 6.0L LQ4
- Year Range: 2001-2007
- Bore/Stroke: 4.030” x 4.000”
- Displacement (cu.in): 408
- Crankshaft: Manley 4340 forged 58 tooth reluctor wheel
- Rods: Manley 4340 forged H beam 6.125” ARP 8740 bolts
- Pistons: Manley 2618 forged -18cc dished moly skirt coated
- Rings: Plasmamoly
- Compression Ratios: 64cc = 10.2:1 / 68cc = 9.9:1 / 72cc = 9.5:1 (can vary due to deck height/gasket thickness)
- Camshaft Bearings: Installed and Clocked to OEM Position
- Freeze Plugs: Installed and Sealed
- Oil Galley Plugs: Installed and Sealed
Recommended Components:
- Balancer- Internal balance
- Flex plate/ Flywheel- Internal balance
- Head Gasket: .051” or per application
- Oil Pump: Melling #10295 with high pressure spring
Engine Info:
- Oil: 10W40 Non synthetic for first 3000 miles
- Oil Filter: Wix or K and N per application
Disclaimer:
The recommended components listed are ATK’s recommendations of parts to be used, applications vary and your build may need something different. Contact ATK for a recommendation if you’re not certain about a component to use. It is the customer’s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts. ATK reserves the right to substitute parts used in engines if necessary.
| KEY SPECS | |
|---|---|
| MFG. Part # | SP31 |
| Brand | ATK Engines |
| Piston Material | Forged Aluminum |
| Crankshaft Material | Forged 4340 Steel |
| Connecting Rod Material | Forged 4340 Steel |
| Engine Balance | Internal |
| Rear Main Seal Style | 1-piece |
| Oil Pan Included | No |
| Timing Cover Included | No |
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