Engines and Components› Pistons and Piston Rings

United Engine & Machine Co

KB HYP PISTON KIT SBC 350

$597.56

SKU: U00B KB404KTM.030

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

Moderate — 2–4 hours

Description

Keith Black Hypereutectic pistons are designed for high-performance applications including marine, drag racing, circle track, street, or towing. They feature a low expansion 390 alloy with 16 percent silicon, allowing for a tighter piston-to-wall running clearance. Wrist pins and spiral locks are included, but rings (1/16 x 1/16 x 3/16) are not. These pistons fit SB Chevy 350 engines with a 4.030 bore.

Fitment

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Specifications

BrandUnited Engine & Machine Co
Part NumberU00B KB404KTM.030

Videos

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SBC Chevy 383 Stroker full roller AFR Heads Big Daddy Cam Test
KB Pistons and Ring End Gap

KB Pistons and Ring End Gap

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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