Engines and Components› Pistons and Piston Rings

United Engine & Machine Co

SILVOLITE HYPERCOATED PISTON

$46.22

SKU: U00B 3499HC.25MM

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

Advanced — 4+ hours

Description

The United Engine & Machine Co 3499HC.25MM is a set of pistons designed for GM LS-Based Engines. These flat top, hypereutectic cast pistons are part of the Silv-O-Lite line and are suitable for engine displacement of 5.7L or 346 cubic inches.

These pistons feature a floating pin type and come with a 10.5:1 compression ratio when used with 64.5cc heads. The ring pack includes a 3.0000mm oil ring and 1.5mm compression rings. They are designed for use with connecting rods of 6.089 inches and a crankshaft stroke of 3.622 inches.

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 3499HC.25MM

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.

View Full Return Policy