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Vehicle Info NeededUNITED ENGINE MACHINEPART NUMBER: 648-KB125.030
Chevy 400ci Hypereutectic Pistons Flat Top
$42784
Ships on 09/08/2026
Lowest Price GuaranteeChevy 400ciFlat Top Pistons Use w/5.700'' Connecting Rods
- Chevy 400ci Hypereutectic Pistons
- Flat Top
- 4.155'' Bore (+.030'')
- Use w/5.700'' Connecting Rod & 3.750'' Crank Stroke
- Comp. Ratio: 12.3/58cc; 11.7/62cc; 11.4/64cc; 10.0/76cc
- 8/pkg
Technical Specs: - Alloy: Hypereutectic 390
- Bore: 4.155'
- Crankshaft Stroke: 3.750'
- Connecting Rod Length: 5.700'
- Deck Height: 9.025'
- Compression Height: 1.433'
- 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: 0.265'
- Ring Grooves: 5/64' Top; 5/64' Middle; 3/16' Bottom
- Gram Weight: 565/145
- Compression Ratio: 12.3:1 w/58cc Heads; 11.7:1 w/62cc Heads; 11.4:1 w/64cc; 10.0:1 w/76cc Heads
Part TypePiston
BrandUNITED ENGINE MACHINE
Package Height3.8
Package Width9.2
Package Length18.1
Weight13.62 PG
Part CategoryPerformance Parts
Piston Head Volume (Cc)7
Compression Distance1.433 in (36.398 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)105.537
Piston StyleFlat top, with two valve reliefs
Bore4.155 in (105.537 mm)
Vendor Part NumberKB125.030
Package Qty1
Package TypeEA
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