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Vehicle Info NeededUNITED ENGINE MACHINEPART NUMBER: 648-KB120.030
Chevy 350ci Hypereutectic Pistons Flat Top
$39697
Ships on 09/08/2026
Lowest Price GuaranteeChevy 350ciFlat Top Pistons Use w/5.700'' Connecting Rods
- Chevy 350ci Hypereutectic Pistons
- Flat Top
- 4.030'' Bore (+.030'')
- Use w/5.700'' Connecting Rod & 3.480'' Crank Stroke
- Comp. Ratio: 10.9/58cc; 10.4/62cc; 10.2/64cc; 9.0/76cc
- 8/pkg
Technical Specs: - Alloy: Hypereutectic 390
- Bore: 4.030'
- Crankshaft Stroke: 3.480'
- Connecting Rod Length: 5.700'
- Deck Height: 9.025'
- Compression Height: 1.561'
- Pin Size: 0.9272'
- Pin Location: Centered
- Flat Top: -7cc 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: 535/145
- Compression Ratio: 10.9:1 w/58cc Heads; 10.4:1 w/62cc Heads; 10.2:1 w/64cc; 9.0:1 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.
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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 Height4.9
Package Width9.6
Package Length18.9
Weight14.3 PG
Part CategoryPerformance Parts
Piston Head Volume (Cc)7
Compression Distance1.561 in (39.649 mm)
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 MaterialHypereutectic aluminum
Pin Diameter0.927 in (23.5 mm)
Part FitmentSemi Universal
Bore (Mm)102.362
Piston StyleFlat top, with two valve reliefs
Bore4.03 in (102.362 mm)
Vendor Part NumberKB120.030
Package Qty1
Package TypeEA
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