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United Engine Machine KB251.040

Chrysler 450ci Hypereutectic Pistons Step Dome Top .260"

United Engine Machine KB251.040


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Estimated ship date 02/22/18 if Ordered Today
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United Engine Machine KB251.040 Chrysler 450ci Hypereutectic Pistons Step Dome Top .260" $293.99
Chrysler 450ci Hypereutectic Pistons
  • Step Dome Top .260''
  • 4.382'' Bore (+.040'')
  • Use w/6.358'' Connecting Rod & 3.750'' Crank Stroke
  • Comp. Ratio: 12.9/72cc; 11.8/80cc; 11.2/85cc; 10.7/90cc
  • 8/pkg

  • United Engine Machine KB251.040 Details

    Chrysler 450ci

  • Step Dome Top Pistons
  • Use with Chrysler 400ci Block
  • Notes:
  • Made from Chrysler 400ci block
  • Use only stock length (6.358'') connecting rods
  • Suggest checking quench dome with clay for clearance
  • Closed chamber heads require the quench dome to be machined down
  • Compression ratio will change with quench dome machining Technical Specs:
  • Alloy: Hypereutectic 390
  • Bore: 4.382''
  • Crankshaft Stroke: 3.750''
  • Connecting Rod Length: 6.358''
  • Deck Height: 9.980''
  • Compression Height: 1.722''
  • Pin Size: 1.094''
  • Pin Location: Centered
  • Step Dome Top: .260'' 4.4cc 2V Relief
  • Intake Valve Relief: 0.264'' Depth / 2.360'' Diameter
  • Exhaust Valve Relief: 0.264'' Depth / 2.360'' Diameter
  • Top Landing Height: 0.221''
  • Ring Grooves: 5/64'' Top; 5/64'' Middle; 3/16'' Bottom
  • Gram Weight: 705/190
  • Compression Ratio: 12.9:1 w/72cc Heads; 11.8:1 w/80cc Heads; 11.2:1 w/85cc Heads; 10.7:1 w/90cc 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