Engines and Components› Pistons and Piston Rings

United Engine & Machine Co

1 SET KB124.030/1 SET 4000BD8.035

$651.44

SKU: U00B KB124KTD.030

Special Order
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 KB124KTD.030 KB Hyper Performance Piston Kit by United Engine & Machine Co. is designed for Ford SB V8 Windsor 5.8L (351 cubic inches) engines with a 4.030" oversized bore. Made from 390 hypereutectic alloy, these pistons feature a flat top with two valve reliefs, a compression height of 1.774 inches, and an OE deck height of 9.500 inches. It includes wrist pins and spiral locks, but rings are sold separately.

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.

Available on iOS & Android

Specifications

BrandUnited Engine & Machine Co
Part NumberU00B KB124KTD.030

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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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