Chevy 327ci Hypereutectic Pistons Solid Dome .100"

Vehicle Info Needed

UNITED ENGINE MACHINEPART NUMBER: 648-KB157.030

Chevy 327ci Hypereutectic Pistons Solid Dome .100"

Name: Chevy 327ci Hypereutectic Pistons Solid Dome .100"
Brand: UNITED ENGINE MACHINE
SKU: 648-KB157.030
Price: 443.41 USD
Availability: InStock

^$443⁴¹

Ships on 11/09/2026

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Chevy 327ci

Dome Top Pistons

Solid Dome .100''
4.030'' Bore (+.030'')
Use w/5.700'' Connecting Rod & 3.250'' Crank Stroke
Comp. Ratio: 11.3/58cc; 10.7/62cc; 10.5/64cc; 9.1/76cc
8/pkg

Technical Specs:
Alloy: Hypereutectic 390
Bore: 4.030'
Crankshaft Stroke: 3.250'
Connecting Rod Length: 5.700'
Deck Height: 9.025'
Compression Height: 1.678'
Pin Size: 0.9272'
Pin Location: Centered
Solid Dome Top: .100' -.5cc 2 Symmetrical Valve Reliefs
Intake Valve Relief: 0.280' Depth / 2.168' Diameter
Exhaust Valve Relief: 0.280' Depth / 2.168' Diameter
Top Landing Height: 0.275'
Ring Grooves: 5/64' Top; 5/64' Middle; 3/16' Bottom
Gram Weight: 585/145
Compression Ratio: 11.3:1 w/58cc Heads; 10.7:1 w/62cc Heads; 10.5:1 w/64cc; 9.1:1 w/76cc Heads

100% CNC Machined Pistons

New high silicon alloys and diamond tooling have give Keith Black designers the material and equipment for performance breakthroughs in engine design. KB piston are 100% CNC machined and T-6 heat treated from 16%-18% silcon Hypereutectic alloy. Features include drilled oil returns and pin oil supply, .072'' spiral wound retaining ring, 100% diamond turned, compensated high strength ring lands, high top ring location, 360° pressure pin oiling, diamond honed pin hole and lightweight rigid rib skirt design.

Features:

390 Hypereutectic alloy with 16% Silicon
Fully machined crowns and valve reliefs
Drilled oil drain backs
Full floating wrist pins
Triple wound spiral locks
Reflective alloy allows 2% power increase
Quench dome technology minimizes deterioration
Zero deck quench designs
Sold in Sets (except when noted as 1 piston per package)

Click here for reference guide to piston top designs

Part TypePiston

Product LineUEM Pistons KB Signature Series Hypereutectic Small Block Chevy Pistons

BrandUNITED ENGINE MACHINE

Package Height4.8

Package Width9.6

Package Length19.0

Weight14.95 PG

Part CategoryPerformance Parts

Piston Ring Thickness (In.)5/64 x 5/64 x 3/16

Wrist Pin StylePress-fit or floating

QuantitySold as a set of 8

Piston StyleDome, with two valve reliefs

Piston Head Volume (Cc)-0.5

Dome Height0.1 in (2.54 mm)

Compression Distance1.678 in (42.621 mm)

Piston MaterialHypereutectic aluminum

Pin Diameter0.927 in (23.5 mm)

Part FitmentSemi Universal

Bore (Mm)102.362

Bore4.03 in (102.362 mm)

Vendor Part NumberKB157.030

Package Qty1

Package TypeEA

Please click here to download the instructions PDF file

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Some parts are not legal for use in California or other states with similar laws / regulations