Engines and Components› Engines, Blocks and Components

ATK ENGINES

LS 408 SHRT BLK DISH 58T

$6,420.37

SKU: A040 SP31-B

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Special Order
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Description

The ATK ENGINES SP31-B is an LS 408CI Stroker Short Block designed for a seasoned 6.0L LQ4 block with ARP main studs, a 4.030” bore, 4.000” stroke, resulting in 408 cubic inches of displacement. It features a Manley 4340 forged 58 tooth reluctor wheel crankshaft, Manley 4340 forged H beam 6.125” rods with ARP 2000 bolts, and Manley 2618 forged -18cc dished moly skirt coated pistons. The short block comes with Total Seal CS AP rings with steel top rings gapped for boost/nitrous. Camshaft bearings, freeze plugs, and oil galley plugs are installed and sealed.

Fitment

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandATK ENGINES
Part NumberA040 SP31-B

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Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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