Exterior Components› Body Panels and Components

United Engine & Machine Co

FORD 302 ROD 5.090 FLAT TOP +6.5CC 2V KB HYPER PISTON SET

$72.96

SKU: U00B KB281.STD

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Non-Returnable Item
INSTALL DIFFICULTY
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Professional / shop required

Description

The United Engine & Machine Co KB281.STD is a set of pistons for performance applications. These hypereutectic aluminum pistons feature a flat-top design with two valve reliefs and a stock stroke type. They are designed with a 4.000 in. bore and a 5.090 in. rod length.

The pistons are manufactured from 390 aluminum alloy and heat-treated to T6 standards, making them 30 percent stronger than ordinary untreated hypereutectics. Key features include 100 percent CNC-machined crowns, a high upper compression-ring location, gas-accumulator groove, drilled oil returns, and spiral-lock retainer grooves.

The set includes press-fit or floating wrist pins and retainers. The ring grooves are 5/64 in. x 5/64 in. x 3/16 in. and are not file-fit. This set is sold as a set of 8.

Fitment

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Specifications

BrandUnited Engine & Machine Co
Part NumberU00B KB281.STD

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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