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Vehicle Info NeededUNITED ENGINE MACHINEPART NUMBER: 648-KB257.STD
Chevy 454ci Hypereutectic Pistons Hollow Dome Top .250"
$46962
Ships on 09/09/2026
Lowest Price GuaranteeChevy 454ciDome Top Pistons
- Chevy 454ci Hypereutectic Pistons
- Hollow Dome Top .250''
- 4.250'' Bore (Standard)
- Use w/6.135'' Connecting Rod & 4.000'' Crank Stroke
- Comp. Ratio: 10.2/119cc
- 8/pkg
Technical Specs: - Alloy: Hypereutectic 390
- Bore: 4.250'
- Crankshaft Stroke: 4.000'
- Connecting Rod Length: 6.135'
- Deck Height: 9.800'
- Compression Height: 1.645'
- Pin Size: 0.990'
- Pin Location: Centered
- Hollow Dome Top: .250' 26cc IV (Open Chamber Head)
- Intake Valve Relief: 0.266' Depth / 2.310' Diameter
- Exhaust Valve Relief: N/A
- Top Landing Height: 0.308'
- Ring Grooves: 5/64' Top; 5/64' Middle; 3/16' Bottom
- Gram Weight: 650/158
- Compression Ratio: 10.2:1 w/119cc Heads
Part TypePiston
BrandUNITED ENGINE MACHINE
Package Height4.0
Package Width9.3
Package Length18.1
Weight15.64 PG
Part CategoryPerformance Parts
Vendor Part NumberKB257.STD
Package Qty1
Package TypeEA
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