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United Engine Machine KB125.030

Chevy 400ci Hypereutectic Pistons Flat Top

United Engine Machine KB125.030
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United Engine Machine KB125.030 Chevy 400ci Hypereutectic Pistons Flat Top $339.99
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Estimated ship date 03/27/18 if Ordered Today
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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

  • United Engine Machine KB125.030 Details

    Chevy 400ci

  • Flat Top Pistons
  • Use w/5.700'' Connecting Rods
  • 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

  • Specifications:

    Bore (in.)
    Bore (mm)
    Compression Distance (in.)
    Pin Diameter (in.)
    Piston Head Volume (cc)
    Piston Material
    Hypereutectic aluminum
    Piston Ring Thickness (in.)
    5/64 x 5/64 x 3/16
    Piston Style
    Flat top, with two valve reliefs
    Sold as a set of 8
    Wrist Pin Style
    Press-fit or floating
    Manufacturer's Part Number:

    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.


    • 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

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