Engines and Components› Pistons and Piston Rings

United Engine & Machine Co

SET KB416.020/SET 4000AM8.020

$627.52

SKU: U00B KB416KTM.020

In Stock
In Stock
Ships by Jun 8
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

Keith Black Hypereutectic pistons are ideal for high-performance builds, featuring a low expansion 390 alloy, fully machined heads and valve reliefs, triple spiral lock rings, CNC machined pin bores, and diamond finished skirts. Includes wrist pins and spiral locks, but rings are sold separately. Designed for Chrysler Small Block 408 engines with a 4.020-inch bore.

Fitment

Fitment Guaranteed

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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

BrandUnited Engine & Machine Co
Part NumberU00B KB416KTM.020

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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