Engines and Components› Pistons and Piston Rings

United Engine & Machine Co

1 SET KB112.STD/1 SET 4000BM8.STD

$474.42

SKU: U00B KB6112KTM.STD

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The KB Performance Hyper piston and ring kit is made from 390 hypereutectic alloy, heat-treated to T-6 standards for increased strength. They feature fully machined crowns and valve pockets and are designed for a 4.060 in. bore GM engine. The kit includes piston rings with moly-coated cast iron or ductile iron top rings.

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 KB6112KTM.STD

Videos

Cast vs Hypereutectic vs Forged Pistons | Whats the Difference?

Cast vs Hypereutectic vs Forged Pistons | Whats the Difference?
The go to Ring compressor tool to install your pistons without damaging the piston rings. #rsgarage

The go to Ring compressor tool to install your pistons without damaging the piston rings. #rsgarage
Piston Cir-Clip Installation

Piston Cir-Clip Installation
ICON FORGED PISTONS, why you need them!!

ICON FORGED PISTONS, why you need them!!
Buy this CHEAP piston ring compressor

Buy this CHEAP piston ring compressor
Part 1: installing pistons and rods in the block.

Part 1: installing pistons and rods in the block.
All Piston Ring settings ✅

All Piston Ring settings ✅
Stock vs race pistons: Which is better?

Stock vs race pistons: Which is better?
piston ring compressor tools use the engine

piston ring compressor tools use the engine
How to Choose The Right Pistons

How to Choose The Right Pistons

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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