Engines and Components› Pistons and Piston Rings

United Engine & Machine Co

KB HYP PISTON KIT OLDS 403

$690.12

SKU: U00B KB405KTD.024

In Stock
In Stock
Ships by Jun 7
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Description

The Keith Black Hypereutectic pistons are designed for high-performance applications with a low expansion 390 alloy, featuring 16 percent silicon for tighter piston-to-wall running clearance. The kit includes fully machined heads and valve reliefs, triple spiral lock rings, CNC machined pin bores, an accumulator groove, machined oil returns, diamond-finished skirts, mini grooves to reduce scuffing and overheating, wrist pins, and spiral locks.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

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 KB405KTD.024

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.

View Full Return Policy