Engines and Components Pistons and Piston Rings

United Engine & Machine Co

1 SET KB215.STD/1 SET 4342AM8.STD

$750.88

SKU: U00B KB215KTM.STD

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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

This piston kit is designed for Chrysler, Dodge, and Plymouth vehicles equipped with the Mopar Big Block B 400 stroker engine, specifically when using a 440 3.750 stroke crankshaft. The pistons feature a standard bore size of 4.342 inches, a 1.722-inch compression height, a 1.094-inch wrist pin, and are compatible with 6.358-inch connecting rods. They have a dome (step head) with a -1.5cc crown, resulting in a compression ratio of 10.9-1 with an 84cc chamber. The kit includes 8 pistons, 8 wrist pins, piston rings, and locks. The pistons are made from cast 390 Hypereutectic Alloy. It is recommended to check quench dome with clay for clearance, as closed chamber heads may require machining of the quench dome. It is designed for use with stock rods.

Fitment

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Specifications

BrandUnited Engine & Machine Co
Part NumberU00B KB215KTM.STD

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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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