Engines and Components› Engines, Blocks and Components

ATK ENGINES

LS 408CI STRK SHRT BLK BOOST READY

$6,352.29

SKU: A040 SP38-B

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

Advanced — 4+ hours

Description

The ATK ENGINES SP38-B is a high-performance 408 cubic inch (6.0L) stroker short block designed specifically for LS Gen IV engines. This short block is engineered for demanding applications, featuring -18cc dish pistons and a 24-tooth reluctor wheel, making it ideal for boosted and nitrous setups. The construction emphasizes durability and performance with components like a seasoned 6.0L LQ4 block with ARP main studs, a Manley 4340 forged crankshaft, Manley 4340 forged H-beam connecting rods with ARP 2000 bolts, and Manley 2618 forged, moly skirt-coated pistons. The Total Seal CS AP piston rings with steel top rings are gapped for boost/nitrous applications.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

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

Available on iOS & Android

Specifications

BrandATK ENGINES
Part NumberA040 SP38-B

Videos

ATK High Performance Engines Unboxed Review

ATK High Performance Engines Unboxed Review

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.

View Full Return Policy