Engines and Components› Pistons and Piston Rings

United Engine & Machine Co

1 SET KB157.STD/1 SET 4000AM8.STD

$567.84

SKU: U00B KB157KTM.STD

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Overview

The United Engine & Machine Co. KB157KTM.STD is a piston and ring kit designed for Chevrolet Small Block V8 Gen I engines. These pistons are constructed from a cast 390 hypereutectic alloy and feature a dome style with a -.5cc crown volume. The kit includes standard bore size pistons with a 4.000-inch bore and is intended for use in engines with a 327 cubic inch displacement (5.4L). They are designed for press-fit or floating pin applications and come with rings.

This kit is compatible with Chevrolet SB V8 Gen I engines manufactured by Chevrolet. It is specifically designed for a 4.000-inch bore and a 3.250-inch stroke with a 5.700-inch rod length. The kit includes pistons with a .100" solid dome and two valve reliefs, suitable for various compression ratios including 11.3:1, 10.7:1, 10.5:1, and 9.1:1. The year range for this specific application is 1962-1969.
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1 SET KB157.STD/1 SET 4000AM8.STD

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

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Specifications

BrandUnited Engine & Machine Co
Part NumberU00B KB157KTM.STD
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Returns & Fitment

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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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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