Exterior Components› Body Panels and Components
United Engine & Machine Co
CHRYSLER HEMI 392 ROD 6.958 FLAT TOP +4CC 2V KB HYPER PISTON SET
SKU: U00B KB289.030
Moderate — 2–4 hours
Description
MIA's Description
These pistons feature a flat top with two valve reliefs and a 4.030 in. bore. They are made from 390 aluminum alloy and heat-treated to T6 standards for increased strength. The pistons have a high upper compression-ring location, gas-accumulator groove, drilled oil returns, and spiral-lock retainer grooves. The rigid-rib skirt design helps stabilize the piston in the bore, contributing to improved oil control, reduced blow-by, and increased ring life.
Fitment
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Specifications
| Brand | United Engine & Machine Co |
| Part Number | U00B KB289.030 |
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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