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United Engine Machine KB257.STD-1

Chevy 454ci Hypereutectic Pistons Hollow Dome Top .250"

United Engine Machine KB257.STD-1


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United Engine Machine KB257.STD-1 Chevy 454ci Hypereutectic Pistons Hollow Dome Top .250" $49.99
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
  • 1/pkg

  • United Engine Machine KB257.STD-1 Details

    Chevy 454ci

  • Dome Top Pistons
  • 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

  • Specifications:

    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