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United Engine Machine KB422.030

Pontiac 400ci Hypereutectic Pistons Solid Dome 10cc +030

United Engine Machine KB422.030


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United Engine Machine KB422.030 Pontiac 400ci Hypereutectic Pistons Solid Dome 10cc +030 $423.99
Pontiac 400ci Hypereutectic Pistons
  • Solid Dome 10cc
  • 4.150" Bore (+.030'')
  • Use w/6.630'' Connecting Rod & 3.750'' Crank Stroke
  • Comp. Ratio: 9.4:1/100cc
  • 8/pkg

  • United Engine Machine KB422.030 Details

    Pontiac 400ci

  • Solid Dome
  • Note: Designed to work with 1967 and later 14-degree heads. Piston is .025" below a 10.250" deck. Check small end of rod to piston before assembly / .045" clearance per side minimum.

    Technical Specs:
  • Alloy: Hypereutectic 390 Alloy
  • Bore: 4.150''
  • Crankshaft Stroke: 3.750''
  • Connecting Rod Length: 6.630''
  • Deck Height: 10.250''
  • Compression Height: 1.710''
  • Pin Size: 0.980'' x 3.000''
  • Pin Location: Centered
  • Solid Dome Top: 10.0cc 2 Valve Reliefs
  • Intake Valve Relief: 0.239" Depth / 2.140" Diameter
  • Exhaust Valve Relief: 0.239" Depth / 2.140" Diameter
  • Top Landing Height: 0.300''
  • Ring Grooves: 5/64'' Top; 5/64'' Middle; 3/16'' Bottom
  • Gram Weight: 582/163
  • Compression Ratio: 9.4:1 w/100cc Combustion Chamber Heads

  • 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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