Exterior Components› Body Panels and Components

United Engine & Machine Co

SNGL CLAIMER PISTON SBC 350

$65.93

SKU: U00B S9904HC.060

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $100
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Description

SNGL CLAIMER PISTON SBC 350

MIA's Description

The United Engine & Machine Co S9904HC.060 is a set of hypereutectic pistons designed for Chevrolet Small Block V8 engines. These pistons feature a 23-degree dome with two valve reliefs and a cylinder bore of 4.030 inches. Constructed from Hypereutectic 390 Alloy, they offer an upgrade from standard cast pistons, typically lasting 3 to 4 seasons.

Each piston has a 1.565-inch compression distance and is designed for use with a 3.480-inch crankshaft stroke and a 5.700-inch connecting rod, yielding a 355ci displacement. They come with anti-friction coating on the skirts, CNC machined pin bores, and diamond-finished skirts for improved durability and performance. Pins are included for press or bushed pin applications.

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 S9904HC.060

Videos

Engine Failure!? Watch if you are running Hypereutectic pistons!

Engine Failure!? Watch if you are running Hypereutectic pistons!
The Truth: Cast vs Hypereutectic Pistons - Which One Is Better? | Engine Building 101 |

The Truth: Cast vs Hypereutectic Pistons - Which One Is Better? | Engine Building 101 |
350 Crate engine part 2: The Great Timing Chain Debate: Dot to Dot vs. 12 O'clock

350 Crate engine part 2: The Great Timing Chain Debate: Dot to Dot vs. 12 O'clock
HOW TO INSTALL PISTONS IN YOUR CHEVY 350 ENGINE!

HOW TO INSTALL PISTONS IN YOUR CHEVY 350 ENGINE!
How Many Guys Does It Take To Install A Piston? Step By Step DIY Engine Building For Beginners

How Many Guys Does It Take To Install A Piston? Step By Step DIY Engine Building For Beginners
Cast vs. Forged Pistons: Which One is Best for Your Engine?

Cast vs. Forged Pistons: Which One is Best for Your Engine?
Swapping Pressed Pistons For The Home Engine Builder

Swapping Pressed Pistons For The Home Engine Builder
350 SBC Engine, Teardown/Full Rebuild, How To Video (rebuild begins at 39:50)

350 SBC Engine, Teardown/Full Rebuild, How To Video (rebuild begins at 39:50)
Installing Pistons and Connecting Rod Assemblies (Engine Building 101)

Installing Pistons and Connecting Rod Assemblies (Engine Building 101)
Engine Building Part 1 - Installing the Crankshaft in a 350 Chevy for a '76 Vette

Engine Building Part 1 - Installing the Crankshaft in a 350 Chevy for a '76 Vette

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