Engines and Components› Pistons and Piston Rings
United Engine & Machine Co
1 SET KB139.STD/1 SET 4125BD8.005
SKU: U00B KB139KTD.STD
Professional / shop required
Description
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
| Brand | United Engine & Machine Co |
| Part Number | U00B KB139KTD.STD |
Videos
Small Block Chevy Engine Build: Piston Assembly (Part 1)
The go to Ring compressor tool to install your pistons without damaging the piston rings. #rsgarage
BUDGET 350 Chevy DIY How to install Pistons and Rings in your SBC
Small Block Chevy Engine Build: Piston Assembly (Part 4)
Fool proof installing pistons on rods of a Small Block Chevy
SBC Piston Ring and Rod Orientation (For the First time Builders)
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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