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Engines and Components› Pistons and Piston Rings

KB PERFORMANCE PISTONS

BBC Domed Piston Set 4.250 Bore +26cc

$609.90 $489.37 Save $120.53

SKU: K02K KB257.STD

In Stock
In Stock
Ships by Jun 8
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Professional / shop required

Description

These KB Performance Pistons are hypereutectic 390 alloy pistons with 16% silicon, designed for Chevrolet Big Block 454ci engines. They feature a 4.250" bore, 4.000" stroke, and are compatible with a 6.135" connecting rod. The set includes 8 pistons, lockrings, and pins.

Fitment

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandKB PERFORMANCE PISTONS
Part NumberK02K KB257.STD

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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