Engines and Components› Engines, Blocks and Components

ATK ENGINES

LS 408 SHRT BLK DISH 24T

$6,461.12

SKU: A040 SP40-G4-B

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Special Order
Ships in 4–6 weeks
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The ATK SP40-G4-B is a performance short block designed for boost/nitrous applications with optimized bearing clearances and ring gap. It features a seasoned 6.0L Iron Gen IV block with ARP main studs, a 4.030” x 4.000” bore/stroke (408 cu.in. displacement), Manley 4340 forged 24-tooth reluctor wheel crankshaft, Manley 4340 forged H-beam 6.125” rods with ARP 2000 bolts, and Manley 2618 forged -29cc dished moly skirt coated pistons.

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 SP40-G4-B

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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